Diodorus I 91-93 and his account of Egyptian mortuary religion have tended to be taken as a primary source and have received increasing attention from Egyptologists. This affects the interpretation of Egyptian material, particularly the two papyri Rhind, the Books of Breathing, and also most recently a passage from the Instructions of papyrus Insinger in an emended reading. However, an examination of the Egyptian evidence reveals that this approach to Diodorus does not find support in Egyptian texts. For Egyptological purposes, rather than taking him as equivalent to Egyptian evidence, Diodorus I 91-93 must be treated as secondary literature which presents its information in a demythologizing way.»