Some scholars of later Indian Buddhism and Tibetan Buddhism say that little or nothing goes back to the Buddha. Ronald Davidson has little confidence that much, if any, of surviving Buddhist scripture is actually the word of the historical Buddha. Geoffrey Samuel says the Pali Canon largely derives from the work of Buddhaghosa and his colleagues in the 5th century CE. Gregory Schopen argues that it is not until the 5th to 6th centuries CE that we have any definite evidence about the contents of the Canon. This position was criticized by A. Wynne.
