Of the three crucial sources of knowledge accepted in common by all the orthodox schools (perception, inference, and verbal testimony), the Charvakas accepted only perception as the valid source of knowledge and disapproves both inference and verbal testimony.

about this lecture- is lecture mein apko bharat ke vilupatho chuke sabse puratan darshan ke bare mein braya ja rha hai . charvak ek nastik vichardhara ya dar.