Carvakas

Charvaka, also known as Lokāyata, is an ancient Indian school of materialism. It is an example of the atheistic schools in the Ancient Indian philosophies. Charvaka holds direct perception, empiricism, and conditional inference as proper sources of knowledge, embraces philosophical skepticism, and rejects ritualism. In other words, the Charvaka epistemology states that whenever one infers a truth from a set of observations or truths, one must acknowledge doubt; inferred knowledge is conditional.