"It seems that some people are not only misled themselves, they also seek to mislead those who listen to them. They speak as if there is only one kind of knowledge and claim this constitutes the aim of contemplation. Now here is a fact which will reveal to you something of the terrible depth of evil into which the worldly philosophers have fallen. The Evil One and his philosophers, who derive their skill in doing philosophy from him, have stolen one of our most useful teachings and use it as dangerous bait. Thus they identify our injunction be attentive to yourself (πρόσεχε σεαυτῷ, Deuteronomy 15:9, LXX) with their motto know thyself (γνῶθι σεαυτόν)."