The Buddha

According to Donald Lopez Jr. "he tended to be known as either Buddha or Sakyamuni in China, Korea, Japan, and Tibet, and as either Gotama Buddha or Samana Gotama ('the ascetic Gotama') in Sri Lanka and Southeast Asia."

Buddha, "Awakened One" or "Enlightened One", is the masculine form of budh (बुध्), "to wake, be awake, observe, heed, attend, learn, become aware of, to know, be conscious again", "to awaken" "'to open up' (as does a flower)", "one who has awakened from the deep sleep of ignorance and opened his consciousness to encompass all objects of knowledge". It is not a personal name, but a title for those who have attained bodhi (awakening, enlightenment). Buddhi, the power to "form and retain concepts, reason, discern, judge, comprehend, understand", is the faculty which discerns truth (satya) from falsehood.

The name of his clan was Gautama (Pali: Gotama). His given name, "Siddhārtha" (the Sanskrit form); the Pali rendering is "Siddhattha"; in Tibetan it is "Dhondup"; in Chinese "Xidaduo"; in Japanese "Shiddatta/Shittatta"; in Korean "Siltalta" means "He Who Achieves His Goal" (Siddhi). The clan name of Gautama means "descendant of Gotama", "Gotama" meaning "one who has the most light", or "one who has most cows" and comes from the fact that Kshatriya clans adopted the names of their house priests.

While the term Buddha is used in the Agamas and the Pali Canon, the oldest surviving written records of the term Buddha is from the middle of the 3rd century BCE, when several Edicts of Ashoka (reigned c. 269–232 BCE) mention the Buddha and Buddhism. Ashoka's Lumbini pillar inscription commemorates the Emperor's pilgrimage to Lumbini as the Buddha's birthplace, calling him the Buddha Shakyamuni‍ (Brahmi script: 𑀩𑀼𑀥 𑀲𑀓𑁆𑀬𑀫𑀼𑀦𑀻 Bu-dha Sa-kya-mu-nī. Śākyamuni, Sakyamuni, or Shakyamuni (Sanskrit: शाक्यमुनि, [ɕaːkjɐmʊnɪ]) means "Sage of the Shakyas".

Tathāgata (Pali; Pali: [tɐˈtʰaːɡɐtɐ]) is a term the Buddha commonly used when referring to himself or other Buddhas in the Pāli Canon. The exact meaning of the term is unknown, but it is often thought to mean either "one who has thus gone" (tathā-gata), "one who has thus come" (tathā-āgata), or sometimes "one who has thus not gone" (tathā-agata). This is interpreted as signifying that the Tathāgata is beyond all coming and going—beyond all transitory phenomena. A tathāgata is "immeasurable", "inscrutable", "hard to fathom", and "not apprehended".

A list of other epithets is commonly seen together in canonical texts and depicts some of his perfected qualities:

Bhagavato (Bhagavan) – The Blessed one, one of the most used epithets, together with tathāgata

Sammasambuddho – Perfectly self-awakened

Vijja-carana-sampano – Endowed with higher knowledge and ideal conduct.

Sugata – Well-gone or well-spoken.

Lokavidu – Knower of the many worlds.

Anuttaro Purisa-damma-sarathi – Unexcelled trainer of untrained people.

Satthadeva-Manussanam – Teacher of gods and humans.

Araham – Worthy of homage. An Arahant is "one with taints destroyed, who has lived the holy life, done what had to be done, laid down the burden, reached the true goal, destroyed the fetters of being, and is completely liberated through final knowledge".

Jina – Conqueror. Although the term is more commonly used to name an individual who has attained liberation in the religion Jainism, it is also an alternative title for the Buddha.

The Pali Canon also contains numerous other titles and epithets for the Buddha, including: All-seeing, All-transcending sage, Bull among men, The Caravan leader, Dispeller of darkness, The Eye, Foremost of charioteers, Foremost of those who can cross, King of the Dharma (Dharmaraja), Kinsman of the Sun, Helper of the World (Lokanatha), Lion (Siha), Lord of the Dhamma, Of excellent wisdom (Varapañña), Radiant One, Torchbearer of mankind, Unsurpassed doctor and surgeon, Victor in battle, and Wielder of power. Another epithet, used at inscriptions throughout South and Southeast Asia, is Maha sramana, "great sramana" (ascetic, renunciate).

Scholars are hesitant to make claims about the historical facts of the Buddha's life. Most of them accept that the Buddha lived, taught, and founded a monastic order during the Mahajanapada period, specifically during the reign of Bimbisara, ruler of Magadha, and died during the reign of Bimbisara's successor Ajatashatru, thus also making him a contemporary of Mahavira, the Jain tirthankara.

There is less consensus on the veracity of many details contained in traditional biographies, as "Buddhist scholars [...] have mostly given up trying to understand the historical person." The earliest versions of Buddhist biographical texts that we have already contain many supernatural, mythical, or legendary elements. In the 19th century, some scholars simply omitted these from their accounts of the life, so that "the image projected was of a Buddha who was a rational, socratic teacher—a great person perhaps, but a more or less ordinary human being". More recent scholars tend to see such demythologisers as remythologisers, "creating a Buddha that appealed to them, by eliding one that did not".

Rupert Gethin contends that "as the Buddhist tradition tells it, the story of the life of the Buddha is not history nor meant to be," and instead his life story has a paradigmatic value communicating transhistorical truths, not just historical events.

The dates of Gautama's birth and death are uncertain. Within the Eastern Buddhist tradition of China, Vietnam, Korea and Japan, the traditional date for Buddha's death was 949 BCE, but according to the Ka-tan system of the Kalachakra tradition, Buddha's death was about 833 BCE.

Buddhist texts present two chronologies which have been used to date the lifetime of the Buddha. The "long chronology", from Sri Lankan chronicles, states the Buddha had a lifespan of 80 years and died 218 years before Asoka's coronation, thus from which it is inferred that he was born about 298 years before the coronation. According to these chronicles, Asoka was crowned in 326 BCE, which gives Buddha's lifespan as 624–544 BCE, and are the accepted dates in Sri Lanka and South-East Asia. Alternatively, most scholars who also accept the long chronology but date Asoka's coronation around 268 BCE (based on Greek evidence) put the Buddha's lifespan later at 566–486 BCE.

However, the "short chronology", from Indian sources and their Chinese and Tibetan translations, while also giving a lifespan of 80 years, place the Buddha's death 100 years before Asoka's coronation, from which his birth is inferred at about 180 years before the coronation. Following the Greek sources of Asoka's coronation as 268 BCE, this dates the Buddha's lifespan even later as 448–368 BCE.

Most historians in the early 20th century use the earlier dates of 563–483 BCE, differing from the long chronology based on Greek evidence by just three years. More recently, there are attempts to put his death midway between the long chronology's 480s BCE and the short chronology's 360s BCE, so circa 410 BCE. At a symposium on this question held in 1988, the majority of those who presented gave dates within 20 years either side of 400 BCE for the Buddha's death. These alternative chronologies, however, have not been accepted by all historians.

The dating of Bimbisara and Ajatashatru also depends on the long or short chronology. In the long chrononology, Bimbisara reigned c. 558 – c. 492 BCE, and died 492 BCE, while Ajatashatru reigned c. 492 – c. 460 BCE. In the short chronology Bimbisara reigned c. 400 BCE, while Ajatashatru died between c. 380 BCE and 330 BCE. According to historian K. T. S. Sarao, a proponent of the Short Chronology wherein the Buddha's lifespan was c. 477–397 BCE, it can be estimated that Bimbisara was reigning c. 457–405 BCE, and Ajatashatru was reigning c. 405–373 BCE.

Two archaeological sites have been linked to the time of the Buddha around the 5th century BCE. The first of these is the Relic Stupa of Vaishali situated in the Indian state of Bihar which is considered to be the earliest archaeologically known stupa. The stupa itself is made of brick and has a clay core that has been enlarged several times. The excavators noted that the final brick addition was contemporary with a nearby 3rd century BCE Mauryan Empire column which would therefore mean that the clay core predated the Mauryans. They also found that the relics within the stupa had been removed at a later date. This would match up with the history of Ashoka who is said to have redistributed the relics of the Buddha in the 3rd century BCE.

The second site is a small wooden structure that was excavated in Lumbini around 2015 which also contained traces of tree roots. Carbon dating has been used to date the structure and the roots to possibly the sixth century BCE.

According to the Buddhist tradition, Shakyamuni Buddha was a Shakya, a sub-Himalayan ethnicity and clan of north-eastern region of the Indian subcontinent. The Shakya community was on the periphery, both geographically and culturally, of the eastern Indian subcontinent in the 5th century BCE. The community, though describable as a small republic, was probably an oligarchy, with his father as the elected chieftain or oligarch. The Shakyas were widely considered to be non-Vedic (and, hence impure) in Brahminic texts; their origins remain speculative and debated. Bronkhorst terms this culture, which grew alongside Aryavarta without being affected by the flourish of Brahminism, as Greater Magadha.

The Buddha's tribe of origin, the Shakyas, seems to have had non-Vedic religious practices which persist in Buddhism, such as the veneration of trees and sacred groves, and the worship of tree spirits (yakshas) and serpent beings (nāgas). They also seem to have built burial mounds called stupas. Tree veneration remains important in Buddhism today, particularly in the practice of venerating Bodhi trees. Likewise, yakshas and nāgas have remained important figures in Buddhist religious practices and mythology.

The Buddha's lifetime coincided with the flourishing of influential śramaṇa schools of thought like Ājīvika, Cārvāka, Jainism, and Ajñana. The Brahmajala Sutta records sixty-two such schools of thought. In this context, a śramaṇa refers to one who labours, toils or exerts themselves (for some higher or religious purpose). It was also the age of influential thinkers like Mahavira, Pūraṇa Kassapa, Makkhali Gosāla, Ajita Kesakambalī, Pakudha Kaccāyana, and Sañjaya Belaṭṭhaputta, as recorded in Samaññaphala Sutta, with whose viewpoints the Buddha must have been acquainted.

Śāriputra and Moggallāna, two of the foremost disciples of the Buddha, were formerly the foremost disciples of Sañjaya Belaṭṭhaputta, the sceptic. The Pāli canon frequently depicts Buddha engaging in debate with the adherents of rival schools of thought. There is philological evidence to suggest that the two masters, Alara Kalama and Uddaka Rāmaputta, were historical figures and they most probably taught Buddha two different forms of meditative techniques. Thus, Buddha was just one of the many śramaṇa philosophers of that time. In an era where holiness of person was judged by their level of asceticism, Buddha was a reformist within the śramaṇa movement, rather than a reactionary against Vedic Brahminism.

Coningham and Young note that both Jains and Buddhists used stupas, while tree shrines can be found in both Buddhism and Hinduism.

The rise of Buddhism coincided with the Second Urbanisation, in which the Ganges Basin was settled and cities grew, in which egalitarianism prevailed. According to Thapar, the Buddha's teachings were "also a response to the historical changes of the time, among which were the emergence of the state and the growth of urban centres". While the Buddhist mendicants renounced society, they lived close to the villages and cities, depending for alms-givings on lay supporters.

According to Dyson, the Ganges basin was settled from the north-west and the south-east, as well as from within, "[coming] together in what is now Bihar (the location of Pataliputra)". The Ganges basin was densely forested, and the population grew when new areas were deforestated and cultivated. The society of the middle Ganges basin lay on "the outer fringe of Aryan cultural influence", and differed significantly from the Aryan society of the western Ganges basin. According to Stein and Burton, "[t]he gods of the brahmanical sacrificial cult were not rejected so much as ignored by Buddhists and their contemporaries." Jainism and Buddhism opposed the social stratification of Brahmanism, and their egalitarism prevailed in the cities of the middle Ganges basin. This "allowed Jains and Buddhists to engage in trade more easily than Brahmans, who were forced to follow strict caste prohibitions."

In the earliest Buddhist texts, the nikāyas and āgamas, the Buddha is not depicted as possessing omniscience (sabbaññu) nor is he depicted as being an eternal transcendent (lokottara) being. According to Bhikkhu Analayo, ideas of the Buddha's omniscience (along with an increasing tendency to deify him and his biography) are found only later, in the Mahayana sutras and later Pali commentaries or texts such as the Mahāvastu. In the Sandaka Sutta, the Buddha's disciple Ananda outlines an argument against the claims of teachers who say they are all knowing while in the Tevijjavacchagotta Sutta the Buddha himself states that he has never made a claim to being omniscient, instead he claimed to have the "higher knowledges" (abhijñā). The earliest biographical material from the Pali Nikayas focuses on the Buddha's life as a śramaṇa, his search for enlightenment under various teachers such as Alara Kalama and his forty-five-year career as a teacher.

Traditional biographies of Gautama often include numerous miracles, omens, and supernatural events. The character of the Buddha in these traditional biographies is often that of a fully transcendent (Skt. lokottara) and perfected being who is unencumbered by the mundane world. In the Mahāvastu, over the course of many lives, Gautama is said to have developed supramundane abilities including: a painless birth conceived without intercourse; no need for sleep, food, medicine, or bathing, although engaging in such "in conformity with the world"; omniscience, and the ability to "suppress karma". As noted by Andrew Skilton, the Buddha was often described as being superhuman, including descriptions of him having the 32 major and 80 minor marks of a "great man", and the idea that the Buddha could live for as long as an aeon if he wished (see DN 16).

The ancient Indians were generally unconcerned with chronologies, being more focused on philosophy. Buddhist texts reflect this tendency, providing a clearer picture of what Gautama may have taught than of the dates of the events in his life. These texts contain descriptions of the culture and daily life of ancient India which can be corroborated from the Jain scriptures, and make the Buddha's time the earliest period in Indian history for which significant accounts exist. British author Karen Armstrong writes that although there is very little information that can be considered historically sound, we can be reasonably confident that Siddhārtha Gautama did exist as a historical figure. Michael Carrithers goes further, stating that the most general outline of "birth, maturity, renunciation, search, awakening and liberation, teaching, death" must be true.

Legendary biographies like the Pali Buddhavaṃsa and the Sanskrit Jātakamālā depict the Buddha's (referred to as "bodhisattva" before his awakening) career as spanning hundreds of lifetimes before his last birth as Gautama. Many of these previous lives are narrated in the Jatakas, which consists of 547 stories. The format of a Jataka typically begins by telling a story in the present which is then explained by a story of someone's previous life.

Besides imbuing the pre-Buddhist past with a deep karmic history, the Jatakas also serve to explain the bodhisattva's (the Buddha-to-be) path to Buddhahood. In biographies like the Buddhavaṃsa, this path is described as long and arduous, taking "four incalculable ages" (asamkheyyas).

In these legendary biographies, the bodhisattva goes through many different births (animal and human), is inspired by his meeting of past Buddhas, and then makes a series of resolves or vows (pranidhana) to become a Buddha himself. Then he begins to receive predictions by past Buddhas. One of the most popular of these stories is his meeting with Dipankara Buddha, who gives the bodhisattva a prediction of future Buddhahood.

Another theme found in the Pali Jataka Commentary (Jātakaṭṭhakathā) and the Sanskrit Jātakamālā is how the Buddha-to-be had to practice several "perfections" (pāramitā) to reach Buddhahood. The Jatakas also sometimes depict negative actions done in previous lives by the bodhisattva, which explain difficulties he experienced in his final life as Gautama.

According to the Buddhist tradition, Gautama was born in Lumbini, now in modern-day Nepal, and raised in Kapilavastu. The exact site of ancient Kapilavastu is unknown. It may have been either Piprahwa, Uttar Pradesh, in present-day India, or Tilaurakot, in present-day Nepal. Both places belonged to the Sakya territory, and are located only 24 kilometres (15 mi) apart.

In the mid-3rd century BCE the Emperor Ashoka determined that Lumbini was Gautama's birthplace and thus installed a pillar there with the inscription: "...this is where the Buddha, sage of the Śākyas (Śākyamuni), was born."

According to later biographies such as the Mahavastu and the Lalitavistara, his mother, Maya, Suddhodana's wife, was a princess from Devdaha, the ancient capital of the Koliya Kingdom (what is now the Rupandehi District of Nepal). Legend has it that, on the night Siddhartha was conceived, Queen Maya dreamt that a white elephant with six white tusks entered her right side, and ten months later Siddhartha was born. As was the Shakya tradition, when his mother became pregnant, she left Kapilavastu for her father's kingdom to give birth.

Her son is said to have been born on the way, at Lumbini, in a garden beneath a sal tree. The earliest Buddhist sources state that the Buddha was born to an aristocratic Kshatriya (Pali: khattiya) family called Gautama (Pali: Gotama), who were part of the Shakyas, a tribe of rice-farmers living near the modern border of India and Nepal. His father Śuddhodana was "an elected chief of the Shakya clan", whose capital was Kapilavastu, and who were later annexed by the growing Kingdom of Kosala during the Buddha's lifetime.

The early Buddhist texts contain very little information about the birth and youth of Gotama Buddha. Later biographies developed a dramatic narrative about the life of the young Gotama as a prince and his existential troubles. They depict his father Śuddhodana as a hereditary monarch of the Suryavansha (Solar dynasty) of Ikṣvāku (Pāli: Okkāka). This is unlikely, as many scholars think that Śuddhodana was merely a Shakya aristocrat (khattiya), and that the Shakya republic was not a hereditary monarchy. The more egalitarian gaṇasaṅgha form of government, as a political alternative to Indian monarchies, may have influenced the development of the śramanic Jain and Buddhist sanghas, where monarchies tended toward Vedic Brahmanism.

The day of the Buddha's birth, enlightenment and death is widely celebrated in Theravada countries as Vesak and the day he was conceived as Poson. Buddha's Birthday is called Buddha Purnima in Nepal, Bangladesh, and India as he is believed to have been born on a full moon day.

According to later biographical legends, during the birth celebrations, the hermit seer Asita journeyed from his mountain abode, analysed the child for the "32 marks of a great man" and then announced that he would either become a great king (chakravartin) or a great religious leader. Suddhodana held a naming ceremony on the fifth day and invited eight Brahmin scholars to read the future. All gave similar predictions. Kaundinya, the youngest, and later to be the first arhat other than the Buddha, was reputed to be the only one who unequivocally predicted that Siddhartha would become a Buddha.

Early texts suggest that Gautama was not familiar with the dominant religious teachings of his time until he left on his religious quest, which is said to have been motivated by existential concern for the human condition. According to the early Buddhist Texts of several schools, and numerous post-canonical accounts, Gotama had a wife, Yasodhara, and a son, named Rāhula. Besides this, the Buddha in the early texts reports that "I lived a spoilt, a very spoilt life, monks (in my parents' home)."

The legendary biographies like the Lalitavistara also tell stories of young Gotama's great martial skill, which was put to the test in various contests against other Shakyan youths.

While the earliest sources merely depict Gotama seeking a higher spiritual goal and becoming an ascetic or śramaṇa after being disillusioned with lay life, the later legendary biographies tell a more elaborate dramatic story about how he became a mendicant.

The earliest accounts of the Buddha's spiritual quest is found in texts such as the Pali Ariyapariyesanā-sutta ("The discourse on the noble quest", MN 26) and its Chinese parallel at MĀ 204. These texts report that what led to Gautama's renunciation was the thought that his life was subject to old age, disease and death and that there might be something better. The early texts also depict the Buddha's explanation for becoming a sramana as follows: "The household life, this place of impurity, is narrow—the samana life is the free open air. It is not easy for a householder to lead the perfected, utterly pure and perfect holy life." MN 26, MĀ 204, the Dharmaguptaka Vinaya and the Mahāvastu all agree that his mother and father opposed his decision and "wept with tearful faces" when he decided to leave.

Legendary biographies also tell the story of how Gautama left his palace to see the outside world for the first time and how he was shocked by his encounter with human suffering. These depict Gautama's father as shielding him from religious teachings and from knowledge of human suffering, so that he would become a great king instead of a great religious leader. In the Nidanakatha (5th century CE), Gautama is said to have seen an old man. When his charioteer Chandaka explained to him that all people grew old, the prince went on further trips beyond the palace. On these he encountered a diseased man, a decaying corpse, and an ascetic that inspired him. This story of the "four sights" seems to be adapted from an earlier account in the Digha Nikaya (DN 14.2) which instead depicts the young life of a previous Buddha, Vipassi.

The legendary biographies depict Gautama's departure from his palace as follows. Shortly after seeing the four sights, Gautama woke up at night and saw his female servants lying in unattractive, corpse-like poses, which shocked him. Therefore, he discovered what he would later understand more deeply during his enlightenment: dukkha ("standing unstable", "dissatisfaction") and the end of dukkha. Moved by all the things he had experienced, he decided to leave the palace in the middle of the night against the will of his father, to live the life of a wandering ascetic.

Accompanied by Chandaka and riding his horse Kanthaka, Gautama leaves the palace, leaving behind his son Rahula and Yaśodhara. He travelled to the river Anomiya, and cut off his hair. Leaving his servant and horse behind, he journeyed into the woods and changed into monk's robes there, though in some other versions of the story, he received the robes from a Brahma deity at Anomiya.

According to the legendary biographies, when the ascetic Gautama first went to Rajagaha (present-day Rajgir) to beg for alms in the streets, King Bimbisara of Magadha learned of his quest, and offered him a share of his kingdom. Gautama rejected the offer but promised to visit his kingdom first, upon attaining enlightenment.

Majjhima Nikaya 4 mentions that Gautama lived in "remote jungle thickets" during his years of spiritual striving and had to overcome the fear that he felt while living in the forests. The Nikaya-texts narrate that the ascetic Gautama practised under two teachers of Vedic-Brahmanic meditation.

Intuiting the original doctrines of the Buddha, and to what extent the precepts of contemporary Buddhism reflect these teachings, is a difficult task. Many of the core principles of Buddhism, including the Eightfold Path, Four Noble Truths, and the concept of moksha, appear to have come after the Buddha himself, and the extent to which the Buddha engaged in philosophical inquiry is uncertain. The earliest surviving Buddhist texts are already sectarian in nature, and reconstructing the beliefs of pre-sectarian Buddhism is rife with difficulties and disagreements among scholars, not all of whom believe a meaningful reconstruction is possible.

One method to obtain information on the oldest core of Buddhism is to compare the oldest versions of the Pali Canon and other texts, such as the surviving portions of Sarvastivada, Mulasarvastivada, Mahisasaka, Dharmaguptaka, and the Chinese Agamas. The reliability of these sources, and the possibility of drawing out a core of oldest teachings, is a matter of dispute. According to Lambert Schmithausen, there are three positions held by modern scholars of Buddhism with regard to the authenticity of the teachings contained in the Nikayas:

"Stress on the fundamental homogeneity and substantial authenticity of at least a considerable part of the Nikayic materials".

"Scepticism with regard to the possibility of retrieving the doctrine of earliest Buddhism".

"Cautious optimism in this respect".

Scholars such as Richard Gombrich, Akira Hirakawa, Alexander Wynne and A.K. Warder hold that these early Buddhist texts contain material that could possibly be traced to the Buddha. Richard Gombrich argues that since the content of the earliest texts "presents such originality, intelligence, grandeur and—most relevantly—coherence...it is hard to see it as a composite work." Thus he concludes they are "the work of one genius". Peter Harvey also agrees that "much" of the Pali Canon "must derive from his [the Buddha's] teachings". Likewise, A. K. Warder has written that "there is no evidence to suggest that it [the shared teaching of the early schools] was formulated by anyone other than the Buddha and his immediate followers." According to Alexander Wynne, "the internal evidence of the early Buddhist literature proves its historical authenticity."

Other scholars of Buddhist studies have disagreed with the mostly positive view that the early Buddhist texts reflect the teachings of the historical Buddha, arguing that some teachings contained in the early texts are the authentic teachings of the Buddha, but not others. Ainslie Embree writes that many sermons credited to the Buddha are the works of later teachers, so there is considerable doubt about his original message. According to Tilmann Vetter, inconsistencies remain, and other methods must be applied to resolve those inconsistencies. According to Tilmann Vetter, the earliest core of the Buddhist teachings is the meditative practice of dhyāna, but "liberating insight" became an essential feature of the Buddhist tradition only at a later date.

He posits that the Fourth Noble Truths, the eightfold path and dependent origination, which are commonly seen as essential to Buddhism, are later formulations which form part of the explanatory framework of this "liberating insight". Lambert Schmithausen similarly argues that the mention of the four noble truths as constituting "liberating insight", which is attained after mastering the four dhyānas, is a later addition. Johannes Bronkhorst also argues that the four truths may not have been formulated in earliest Buddhism, and did not serve in earliest Buddhism as a description of "liberating insight".

Edward Conze argued that the attempts of European scholars to reconstruct the original teachings of the Buddha were "all mere guesswork".

A number of teachings and practices are deemed essential to Buddhism, including: the samyojana (fetters, chains or bounds), that is, the sankharas ("formations"), the kleshas (unwholesome mental states), including the three poisons, and the āsavas ("influx, canker"), that perpetuate saṃsāra, the repeated cycle of becoming; the six sense bases and the five aggregates, which describe the process from sense contact to consciousness which lead to this bondage to saṃsāra; dependent origination, which describes this process, and its reversal, in detail; and the Middle Way, summarised by the later tradition in the Four Noble Truths and the Noble Eightfold Path, which prescribes how this bondage can be reversed.

According to N. Ross Reat, the Theravada Pali texts and the Mahasamghika school's Śālistamba Sūtra share

these basic teachings and practices. Bhikkhu Analayo concludes that the Theravada Majjhima Nikaya and Sarvastivada Madhyama Agama contain mostly the same major doctrines. Likewise, Richard Salomon has written that the doctrines found in the Gandharan Manuscripts are "consistent with non-Mahayana Buddhism, which survives today in the Theravada school of Sri Lanka and Southeast Asia, but which in ancient times was represented by eighteen separate schools".

All beings have deeply entrenched samyojana (fetters, chains or bounds), that is, the sankharas ("formations"), kleshas (unwholesome mental states), including the three poisons, and āsavas ("influx, canker"), that perpetuate saṃsāra, the repeated cycle of becoming and rebirth. According to the Pali suttas, the Buddha stated that "this saṃsāra is without discoverable beginning. A first point is not discerned of beings roaming and wandering on hindered by ignorance and fettered by craving." In the Dutiyalokadhammasutta sutta (AN 8:6) the Buddha explains how "eight worldly winds" "keep the world turning around [...] Gain and loss, fame and disrepute, praise and blame, pleasure and pain". He then explains how the difference between a noble (arya) person and an uninstructed worldling is that a noble person reflects on and understands the impermanence of these conditions.

This cycle of becoming is characterised by dukkha, commonly referred to as "suffering", dukkha is more aptly rendered as "unsatisfactoriness" or "unease". It is the unsatisfactoriness and unease that comes with a life dictated by automatic responses and habituated selfishness, and the unsatifacories of expecting enduring happiness from things which are impermanent, unstable and thus unreliable. The ultimate noble goal should be liberation from this cycle.

Samsara is dictated by karma, which is an impersonal natural law, similar to how certain seeds produce certain plants and fruits. Karma is not the only cause for one's conditions, as the Buddha listed various physical and environmental causes alongside karma. The Buddha's teaching of karma differed to that of the Jains and Brahmins, in that on his view, karma is primarily mental intention (as opposed to mainly physical action or ritual acts). The Buddha is reported to have said "By karma I mean intention." Richard Gombrich summarises the Buddha's view of karma as follows: "all thoughts, words, and deeds derive their moral value, positive or negative, from the intention behind them".

The āyatana (six sense bases) and the five skandhas (aggregates) describe how sensory contact leads to attachment and dukkha. The six sense bases are eye and sight, ear and sound, nose and odour, tongue and taste, body and touch, and mind and thoughts. Together they create the input from which we create our world or reality, "the all". This process takes place through the five skandhas, "aggregates", "groups", "heaps", five groups of physical and mental processes, namely form (or material image, impression) (rupa), sensations (or feelings, received from form) (vedana), perceptions (samjna), mental activity or formations (sankhara), consciousness (vijnana). They form part of other Buddhist teachings and lists, such as dependent origination, and explain how sensory input ultimately leads to bondage to samsara by the mental defilements.

In the early texts, the process of the arising of dukkha is explicated through the teaching of dependent origination, which says that everything that exists or occurs is dependent on conditioning factors. The most basic formulation of dependent origination is given in the early texts as: 'It being thus, this comes about' (Pali: evam sati idam hoti). This can be taken to mean that certain phenomena only arise when there are other phenomena present, thus their arising is "dependent" on other phenomena.

The philosopher Mark Siderits has outlined the basic idea of the Buddha's teaching of dependent origination of dukkha as follows:

given the existence of a fully functioning assemblage of psycho-physical elements (the parts that make up a sentient being), ignorance concerning the three characteristics of sentient existence—suffering, impermanence and non-self—will lead, in the course of normal interactions with the environment, to appropriation (the identification of certain elements as 'I' and 'mine'). This leads in turn to the formation of attachments, in the form of desire and aversion, and the strengthening of ignorance concerning the true nature of sentient existence. These ensure future rebirth, and thus future instances of old age, disease and death, in a potentially unending cycle.

In numerous early texts, this basic principle is expanded with a list of phenomena that are said to be conditionally dependent, as a result of later elaborations, including Vedic cosmogenies as the basis for the first four links. According to Boisvert, nidana 3-10 correlate with the five skandhas. According to Richard Gombrich, the twelve-fold list is a combination of two previous lists, the second list beginning with tanha, "thirst", the cause of suffering as described in the second noble truth". According to Gombrich, the two lists were combined, resulting in contradictions in its reverse version.

The Buddha saw his analysis of dependent origination as a "Middle Way" between "eternalism" (sassatavada, the idea that some essence exists eternally) and "annihilationism" (ucchedavada, the idea that we go completely out of existence at death). in this view, persons are just a causal series of impermanent psycho-physical elements, which are anatta, without an independent or permanent self. The Buddha instead held that all things in the world of our experience are transient and that there is no unchanging part to a person. According to Richard Gombrich, the Buddha's position is simply that "everything is process".

The Buddha's arguments against an unchanging self rely on the scheme of the five skandhas, as can be seen in the Pali Anattalakkhaṇa Sutta (and its parallels in Gandhari and Chinese). In the early texts the Buddha teaches that all five aggregates, including consciousness (viññana, which was held by Brahmins to be eternal), arise due to dependent origination. Since they are all impermanent, one cannot regard any of the psycho-physical processes as an unchanging self. Even mental processes such as consciousness and will (cetana) are seen as being dependently originated and impermanent and thus do not qualify as a self (atman).

The Buddha saw the belief in a self as arising from our grasping at and identifying with the various changing phenomena, as well as from ignorance about how things really are. Furthermore, the Buddha held that we experience suffering because we hold on to erroneous self views. As Rupert Gethin explains, for the Buddha, a person is

... a complex flow of physical and mental phenomena, but peel away these phenomena and look behind them and one just does not find a constant self that one can call one's own.

Early sources depict the Buddha's appearance as similar to other Buddhist monks. Various discourses describe how he "cut off his hair and beard" when renouncing the world. Likewise, Digha Nikaya 3 has a Brahmin describe the Buddha as a shaved or bald (mundaka) man. Digha Nikaya 2 also describes how king Ajatashatru is unable to tell which of the monks is the Buddha when approaching the sangha and must ask his minister to point him out. Likewise, in MN 140, a mendicant who sees himself as a follower of the Buddha meets the Buddha in person but is unable to recognise him.

The Buddha is also described as being handsome and with a clear complexion (Digha I:115; Anguttara I:181), at least in his youth. In old age, however, he is described as having a stooped body, with slack and wrinkled limbs.

Various Buddhist texts attribute to the Buddha a series of extraordinary physical characteristics, known as "the 32 Signs of the Great Man" (Skt. mahāpuruṣa lakṣaṇa).

According to Anālayo, when they first appear in the Buddhist texts, these physical marks were initially held to be imperceptible to the ordinary person, and required special training to detect. Later though, they are depicted as being visible by regular people and as inspiring faith in the Buddha.

These characteristics are described in the Digha Nikaya's Lakkhaṇa Sutta (D, I:142).

In Mahāyāna Buddhism, the figure of Śākyamuni Buddha (Chinese: 釋迦牟尼佛, romanized: Shìjiāmóunífó) retains his central role as the historical Buddha who lived and taught in ancient India. However, Mahāyāna developments introduce significant reinterpretations of his nature, activities, and metaphysical status, presenting a cosmic, timeless identity. Unlike the more human-centered portrayals, Mahāyāna works present Śākyamuni as a transcendent being of inconceivable qualities, who operates within a vast cosmological framework. Moreover, Mahāyāna sutras often depict Śākyamuni preaching in vast assemblies composed of bodhisattvas, gods, other Buddhas, and beings from other realms. These assemblies vastly exceed the human scale of early canonical suttas.

In many Mahāyāna scriptures, Śākyamuni is presented as the preacher of profound Mahāyāna teachings intended for advanced bodhisattvas. In contrast to the mainstream Nikāya/Āgama presentations of Śākyamuni as a renunciant teacher, Mahāyāna texts emphasise his boundless wisdom, vast power, and infinite compassion. Furthermore, according to Mahāyāna sutras, Śākyamuni teaches myriad teachings according to the capacities of beings. Thus, what appears to be the classic teaching of the sravakayana path taught in the Nikāyas/Āgamas is considered a provisional teaching, which is preparatory to the ultimate Mahāyāna Dharma. The Lotus Sūtra develops this idea most explicitly, portraying Śākyamuni as a master teacher who uses various skillful means (upaya) to guide beings to the One Vehicle (ekayāna) which leads to Buddhahood for all.

While Śākyamuni is the central Buddha of our world (often called Sahā), Mahāyāna cosmology includes countless Buddhas presiding over various buddhafields. Śākyamuni is often depicted as one among an infinite assembly of Buddhas, yet his salvific function remains paramount in many texts. The Avataṃsaka Sūtra also presents Śākyamuni as inseparable from the cosmic Buddha Vairocana. The Gaṇḍavyūha Sūtra (a part of the Avataṃsaka) describes Śākyamuni's activities as pervading all worlds and times, manifesting various forms for the sake of sentient beings. He is sometimes seen as a Buddha who simultaneously appears in countless forms (bodhisattvas, teachers, even ordinary beings), subverting any fixed notion of a singular historical presence.

In contrast with early Buddhist views that emphasise the Buddha's struggle on the spiritual path, Mahāyāna scriptures, such as the Avataṃsaka Sūtra and Lotus Sūtra, portray Śākyamuni as already fully enlightened countless eons ago. Thus, his attainment under the Bodhi tree is also a didactic device (upaya), a demonstration for the sake of others rather than an actual personal breakthrough from delusion to awakening. This Śākyamuni who appeared to be born as a prince in the Śākya clan in India is understood to be a nirmāṇakāya, a docetic emanation. His apparent human birth, life, attainment of enlightenment, and death were skillful manifestations designed to teach and guide sentient beings, rather than literal events in the life of a finite being. The Mahāparinirvāṇa Sūtra reinforces this doctrine by denying that the Buddha truly enters parinirvāṇa. His apparent death is merely another teaching device. In fact, he remains eternally active, and his dharma-body (dharmakāya) continues to benefit beings. These texts collectively assert that the true Śākyamuni is eternal, unconditioned, and ever-present, even though he assumes various forms adapted to the spiritual capacities of those he teaches.

A central doctrinal framework for understanding Śākyamuni in Mahāyāna thought is the trikāya ("triple body") doctrine, which holds that Buddhas have a triune body: (1) Nirmāṇakāya ("emanation body"), the body which appears in the world, (2) Saṃbhogakāya ("enjoyment body"), a resplendent supranatural form, and (3) Dharmakāya, the formless body of ultimate reality. Through this framework, the "historical" Śākyamuni is not merely a historical teacher, but a cosmic being whose appearance on earth is but one of countless manifestations. His true identity is that of the saṃbhoga- and dharmakāyas, which extend beyond the limits of space and time. Not limited to a single location or lifespan, his bodies permeate the entire cosmos, appearing in innumerable worlds. In this view, the universe itself is Śākyamuni's pure land, gradually being purified and transformed through his spiritual presence and teaching. This aligns with Mahāyāna cosmology in which Buddhas are not absent from the world and never abandon it due to their great compassion.