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In page Indian religions:

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Āstika and nāstika are variously defined terms sometimes used to categorise Indian religions. The traditional definition, followed by Adi Shankara, classifies religions and persons as āstika and nāstika according to whether they accept the authority of the main Hindu texts, the Vedas, as supreme revealed scriptures, or not. By this definition, Nyaya, Vaisheshika, Samkhya, Yoga, Purva Mimamsa and Vedanta are classified as āstika schools, while Charvaka is classified as a nāstika school. Buddhism and Jainism are also thus classified as nāstika religions since they do not accept the authority of the Vedas.[citation needed]