Āstika and nāstika 古印度六派哲学
(重定向自Nastika)
Āstika ("there is, there exists") and nāstika ("not āstika") are concepts used by the Brahmanical tradition, and modern scholars to classify and contrast Indian philosophies. Āstika has been defined in one of three ways; as those who accept the epistemic authority of the Vedas, as those who accept the existence of ātman, or as those who accept the existence of Ishvara. In contrast, nāstika are those who deny the respective foundational definitions of āstika.