The Republic by Plato Part 3 Page 88

intelligence which there may be in him, having no taste of any sort of learning or enquiry or thought or culture, grow feeble and dull and blind, his mind never waking up or receiving nourishment, and his senses not being purged of their mists?

True, he said.

And he ends by becoming a hater of philosophy, uncivilized, never using the weapon of persuasion, — he is like a wild beast, all violence and fierceness, and knows no other way of dealing; and he lives in all ignorance and evil conditions, and has no sense of propriety and grace.

That is quite true, he said.

And as there are two principles of human nature, one the spirited and the other the philosophical, some God, as I should say, has given mankind two arts answering to them