Hinduism and Buddhism have common origins in Ancient India, which later spread and became dominant religions in Southeast Asian countries, including Cambodia and Indonesia around the 4th century CE. Buddhism arose in the Gangetic plains of Eastern India in the 5th century BCE during the Second Urbanisation (600–200 BCE). Hinduism developed as a fusion or synthesis of practices and ideas from the ancient Vedic religion and elements and deities from other local Indian traditions, including the sramanic movement and Buddhism.
Both religions share many beliefs and practices but also exhibit pronounced differences that have led to significant debate.Y. Masih in A Comparative Study of Religions (2000), Motilal Banarsidass Publishers: Delhi, Page 18. "There is no evidence to show that Jainism and Buddhism ever subscribed to vedic sacrifices, vedic deities or caste. They are parallel or native religions of India and have contributed much to the growth of even classical Hinduism of the present times." Both religions share a belief in karma and rebirth (or reincarnation). They both accept the idea of spiritual liberation (moksha or nirvana) from the cycle of reincarnation and promote similar religious practices, such as dhyana, samadhi, mantra, and devotion. Both religions also share many deities (though their nature is understood differently), including Saraswati, Vishnu (Upulvan), Mahakala, Indra, Ganesha, and Brahma.
However, Buddhism notably rejects fundamental Hindu doctrines such as atman (substantial self or soul), Brahman (a universal eternal source of everything), and the existence of a creator God (Ishvara). Instead, Buddhism teaches not-self (anatman) and dependent arising as fundamental metaphysical theories.
Origins
Buddhism Historically, the roots of Buddhism lie in the religious thought of Iron Age India around the middle of the first millennium BCE. This was a period of great intellectual ferment and socio-cultural change known as the Second Urbanisation, marked by the growth of towns and trade, the composition of the Upanishads and the historical emergence of the Śramaṇa traditions.
New ideas developed both in the Vedic tradition in the form of the Upanishads, and outside of the Vedic tradition through the Śramaṇa movements.; Quote: "But the Upanishadic ultimate meaning of the Vedas, was, from the viewpoint of the Vedic canon in general, clearly a new idea.."; p. 95: The [oldest] Upanishads in particular were part of the Vedic corpus (...) When these various new ideas were brought together and edited, they were added on to the already existing Vedic..."; p. 294: "When early Jainism came into existence, various ideas mentioned in the extant older Upanishads were current,....".; Quote: "In the Aranyakas therefore, thought and inner spiritual awareness started to separate subtler, deeper aspects from the context of ritual performance and myth with which they had been united up to then. This process was then carried further and brought to completion in the Upanishads. (...) The knowledge and attainment of the Highest Goal had been there from the Vedic times. But in the Upanishads inner awareness, aided by major intellectual breakthroughs, arrived at a language in which Highest Goal could be dealt with directly, independent of ritual and sacred lore".;; Quote: "But he [Bronkhorst] talks about the simultaneous emergence of a Vedic and a non-Vedic asceticism. (...) [On Olivelle] Thus, the challenge for old Vedic views consisted of a new theology, written down in the early Upanishads like the Brhadaranyaka and the Mundaka Upanishad. The new set of ideas contained the...." The term Śramaṇa refers to several Indian religious movements parallel to but separate from the historical Vedic religion, including Buddhism, Jainism and others such as Ājīvika.AL Basham (1951), History and Doctrines of the Ajivikas – a Vanished Indian Religion, Motilal Banarsidass, , pp. 94–103
Several Śramaṇa movements are known to have existed in India before the 6th century BCE (pre-Buddha, pre-Mahavira), and these influenced both the āstika and nāstika traditions of Indian philosophy.Reginald Ray (1999), Buddhist Saints in India, Oxford University Press, , pp. 237–240, 247–249 According to Martin Wiltshire, the Śramaṇa tradition evolved in India over two phases, namely Paccekabuddha and Savaka phases, the former being the tradition of individual ascetic and the latter of disciples, and that Buddhism and Jainism ultimately emerged from these.Martin Wiltshire (1990), Ascetic Figures Before and in Early Buddhism, De Gruyter, , p. 293 Brahmanical and non-Brahmanical ascetic groups shared and used several similar ideas, but the Śramaṇa traditions also drew upon already established Brahmanical concepts and philosophical roots, states Wiltshire, to formulate their own doctrines.Martin Wiltshire (1990), Ascetic Figures Before and in Early Buddhism, De Gruyter, , pp. 226–227 Brahmanical motifs can be found in the oldest Buddhist texts, using them to introduce and explain Buddhist ideas. For example, prior to Buddhist developments, the Brahmanical tradition internalised and variously reinterpreted the three Vedic sacrificial fires as concepts such as Truth, Rite, Tranquility or Restraint. Buddhist texts also refer to the three Vedic sacrificial fires, reinterpreting and explaining them as ethical conduct.
The Śramaṇa religions challenged and broke with the Brahmanic tradition on core assumptions such as Atman (soul, self), Brahman, the nature of afterlife, and they rejected the authority of the Vedas and Upanishads.P. Billimoria (1988), Śabdapramāṇa: Word and Knowledge, Studies of Classical India Volume 10, Springer, , pp. 1–30 Buddhism was one among several Indian religions that did so.
Hinduism
Scholars regard Hinduism as a fusion or synthesis of various Indian cultures and traditions. Among its roots are the historical Vedic religion, itself already the product of "a composite of the Indo-Aryan and Harappan cultures and civilizations", which evolved into the Brahmanical religion and ideology of the Kuru kingdom of Iron Age northern India; but also the Śramaṇa or renouncer traditions of northeast India, and mesolithic and neolithic cultures of India, such as the religions of the Indus Valley Civilisation,; ; ; . Dravidian traditions,; ; ; . and the local traditions and tribal religions.
This Hindu synthesis emerged after the Vedic period, between 500-200 BCE and c. 300 CE, in or after the period of the Second Urbanisation, and during the early classical period of Hinduism, when the Epics and the first Puranas were composed. This Brahmanical synthesis incorporated śramaṇic and Buddhist influences and the emerging bhakti tradition into the Brahmanical fold via the smriti literature. This synthesis emerged under the pressure of the success of Buddhism and Jainism. During the Gupta reign the first Puranas were written, which were used to disseminate "mainstream religious ideology amongst pre-literate and tribal groups undergoing acculturation." The resulting Puranic Hinduism differed markedly from the earlier Brahmanism of the Dharmasutras and the smritis. Hinduism co-existed for several centuries with Buddhism, with Hinduism gaining greater prominence in the 8th century through the efforts of Kumarila and Shankara.
Similarities
Terms and teachings
Buddhism and Hinduism share numerous terms and concepts such as: dharma, karma, samadhi, samsara, dhyana, jñana, klesha, nirodha, samskāra, brahmin, brahmacarya, and nirvana.
Numerous religious terms used by Buddha are also used in Hinduism, though he often used them in different and novel ways. Many terms which Buddhism shares with Hinduism carry a different meaning in the Buddhist tradition. For example, in the Samaññaphala Sutta, the Buddha is depicted presenting a notion of the "three knowledges" (tevijja) – a term also used in the Vedic tradition to describe knowledge of the Vedas – as being not texts, but things that he had experienced. The true "three knowledges" are said to be constituted by the process of achieving enlightenment, which is what the Buddha is said to have achieved in the three watches of the night of his enlightenment."The brahmin by caste alone, the teacher of the Veda, is (jokingly) etymologized as the 'non-meditator' (ajhāyaka). Brahmins who memorize the three Vedas (tevijja) really know nothing: it is the process of achieving Enlightenment—what the Buddha is said to have achieved in the three watches of that night—that constitutes the true 'three knowledges.' " R.F. Gombrich in Paul Williams, ed., "Buddhism: Critical Concepts in Religious studies." Taylor and Francis 2006, page 120.
Karma, rebirth, and samsara
Karma is a central part of Hindu and Buddhist teachings. Karma is a word meaning action or activity and often implies its subsequent results (also called karmaphala, "the fruits of action"). Karma theory is commonly applied to the ethical realm of cause and effect in both Buddhism and Hinduism. In Buddhism and in Hinduism, a person's words, thoughts and actions form the basis for good and bad karma. Good deeds (good karmas) lead to good karmic results (Sanskrit: karma-phala, the fruits of karma) which can include the circumstances of one's future reincarnation. Likewise, evil actions might result in negative karmic consequences.Lawrence C. Becker & Charlotte B. Becker, Encyclopedia of Ethics, 2nd Edition, , Hindu Ethics, pp 678
Thus, the Indian idea of karma is also closely associated with the idea of reincarnation or rebirth. One's karma in previous lives affect one's present existence, and one's actions in this life will lead to effects in the next life. Both Buddhism and Hinduism accept that living beings are constantly cycling through different bodies and realms of existence, in a repetitive process called saṃsāra (literally "the wandering")."Karma" in: John Bowker (1997), The Concise Oxford Dictionary of World Religions, Oxford University Press.James Lochtefeld (2002), The Illustrated Encyclopedia of Hinduism, Rosen Publishing, New York, , pp 351–352
Dharma
Dharma (Sanskrit, Devanagari: धर्म or Pāli Dhamma) is an Indic term common to all Indian religions. Dharma can mean nature, natural law, reality, teaching, religion or duty, and with respect to its significance for spirituality and religion might be considered the way of the higher truths. A Hindu appellation for Hinduism itself is Sanātana Dharma, which translates as "the eternal dharma". Similarly, Buddha Dharma is a common way that Buddhists refer to Buddhism.
In Hinduism, Dharma can refer generally to religious duty or universal order (similar to rta), and also mean social order, right conduct, or simply virtue. In Buddhism, Dharma can mean the true nature of things or the natural law that the Buddha discovered. It can also refer to the teachings of the Buddha, which explain and reveal this nature.
Asceticism and monasticism Both Buddhism and some forms of Hinduism emphasize the importance of monasticism. In Buddhism, the monastic sangha plays a central role in teaching and passing down the Buddha's Dharma. Monasticism is also seen as an ideal way of life for cultivating the qualities that lead to awakening. In certain sects of Hinduism, the life of the renouncer (sannyasa) is also very important.
Cosmology and deities
Buddhist cosmology and Hindu cosmology share many similarities. Both cosmologies are cyclical and both accept that the universe goes through constant cycles of growth and destruction. Both traditions also accept that there are many different realms or worlds (lokas) other than the human realm.Buswell, Robert E., ed. (2004), Encyclopedia of Buddhism, pp. 711–712. MacMillan Reference Books, These include various hell realms and celestial deva realms.
Buddhism and Hinduism share some of the same deities, including:
Saraswati (known as Benzaiten in Japan), Vishnu (known as Upulvan in Sri Lanka),