Charvaka and the Lokayata

Every one of its own books is lost. Everything popularly quoted as Charvaka doctrine comes from hostile summaries written by its philosophical opponents, and the only surviving sceptical text from within the tradition itself was not even edited into print until 1940.

Jayarashi's Tattvopaplavasimha (8th c.), the sole surviving text, edited 1940; Madhava's Sarvadarshanasamgraha (14th c.), a hostile summary