Full Idea
Unless a man is born with a heaven-sent aversion to wrong-doing, or acquires the knowledge to refrain from it, he will never do right of his own free will.
Gist of Idea
We avoid evil either through a natural aversion, or because we have acquired knowledge
Source
Plato (The Republic [c.371 BCE], 366c)
Book Reference
Plato: 'Republic', ed/tr. Waterfield,Robin [OUP 1993], p.55
A Reaction
This is the territory explored so carefully by Aristotle (after he had read Republic!). It is hard to see what the knowledge could be, other than awareness of consequences.