The Hymns of Hermes by G. R. S. Mead

Clement of Alexandria tells us that the whole of the religious philosophy-that is, the wisdom, discipline and multifarious arts and sciences-of the Egyptian priesthood was contained in the Books of Hermes, that is of Thoth. These Books, he informs us further, were classified under forty-two heads and divided into a number of groups according to the various septs or divisions of the priests.