Book X, 50

I deny that Circe, as Homer says, changed those who visited her from men into pigs or wolves. No she was a cunning courtesan, and made them who took her bait poorest of the poor. Stripping them of their human sense, she now, when they could gain nothing for themselves, reared them in her house like senseless animals. But Ulysses, having his wits about him and avoiding the folly of youth, possessed a counter-charm to enchantment, his own nature, not Hermes, emplanting reason in him.