In his Hieroglyphics, Horapollo writes:
"...the monad is the source of all number."
Boas comments on the Monad in his notes:
"That the monad is the source of all number is of course a commonplace of Greek thought, but there is a passage in the Hermetica which dwells upon it and which may be worth referring to here as a Greco-Egyptian source of the notion. See Stobaeus,I,10 (306), ed.Meineke,p.81, where the monad is described as the arche and root of all things, containing all numbers and contained by none, generating all other numbers and generated by itself alone."