Hence, whenever someone tells us that he has met a person who knows all the crafts as well as all the other things that anyone else knows and that his knowledge of any subject is more exact than any of theirs is, we must assume that we're talking to a simple minded fellow who has apparently encountered some sort of magician or imitator and been deceived into thinking him omniscient and that the reason he has been deceived is that he himself can't distinguish between knowledge, ignorance, and imitation.