In non-technical usage, the term astika is sometimes loosely translated as "theist" while nastika is translated as "atheist".[3] However this interpretation is distinct from the use of the term in Hindu philosophy. Notably even among the astika schools, samkhya[4]and the early mimamsa school do not accept a God (see Atheism in Hinduism) while accepting the authority of the Vedas; they thus are "atheistic astika schools".
The different usages of these terms are explained by Chatterjee and Datta as follows:
In modern Indian languages, 'āstika' and 'nāstika' generally mean 'theist' and 'atheist', respectively. But in Sanskrit philosophical literature, 'āstika' means 'one who believes in the authority of the Vedas' or 'one who believes in life after death'. ('nāstika' means the opposite of these). The word is used here in the first sense. In the second sense, even the Jaina and Buddha schools are 'āstika', as they believe in life after death. The six orthodox schools are 'āstika', and the Cārvāka is 'nāstika' in both the senses.[5]
Astika (IAST:āstika) is a Sanskrit adjective (and noun) that is derived from asti ("it is or exists")[6] meaning "believing" or "pious";[7] or "one who believes in the existence (of God, of another world, etc.)."[6]Nastika (na (not) + āstika) is its negative, literally meaning "not believing" or "not pious". As used in Hindu philosophy the differentiation between astika and nastika refers to belief in Vedic authority, not belief or lack of belief in theism. As N. N. Bhattacharyya writes:
The followers of Tantra are often branded as Nāstika by the upholders of the Vedic tradition. The term Nāstika does not denote an atheist. It is applied only to those who do not believe in the Vedas. The Sāṅkhyas and Mīmāṃsakas do not believe in God, but they believe in the Vedas and hence they are not Nāstikas. The Buddhists, Jains, and Cārvākas do not believe in the Vedas; hence they are Nāstikas.[8]
Classification of schools
Many Indian intellectual traditions were codified during the medieval period into a standard list of six orthodox systems, the shaddarshanas (şaddarśana), all of which cite Vedic authority as their source:[9]
The use of the term nastika to describe Buddhism and Jainism in India is explained by Gavin Flood as follows:
At an early period, during the formation of the Upanişads and the rise of Buddhism and Jainism, we must envisage a common heritage of meditation and mental discipline practiced by renouncers with varying affiliations to non-orthodox (Veda-rejecting) and orthodox (Veda-accepting) traditions.... These schools [such as Buddhism and Jainism] are understandably regarded as heterodox (nāstika) by orthodox (āstika) Brahmanism. [10]
The Tantric traditions in Hinduism, have both astika and nastika lines; as Banerji writes in "Tantra in Bengal":
Tantras are ... also divided as āstika or Vedic and nāstika or non-Vedic. In accordance with the predominance of the deity the āstika works are again divided as Śākta, Śaiva, Saura, Gāṇapatya and Vaiṣṇava.[11]
^ For an overview of this method of classification, with detail on the grouping of schools, see: Radhakrishnan & Moore 1989
^ For instance, the "Atheist Society of India" produces a monthly publications Nasthika Yugam which it translates as "The Age of Atheism".
^ "By Sāṃkhya reasoning, the material principle itself simply evolves into complex forms, and there is no need to hold that some spiritual power governs the material principle or its ultimate source." Francis Clooney, CJ, "Restoring 'Hindu Theology' as a category in Indian intellectual discourse", in Flood 2003