From: The Republic, Book I

He who refuses to rule is liable to be ruled by one who is worse than himself.

He who is of a certain nature, is like those who are of a certain nature; he who is not, not.

Mankind censure injustice, fearing that they may be victims of it and not because they shrink from committing it.

A person of skill never makes a mistake in so far as he is what his name(read: skill) implies; they none of them err unless their skill fails them, and they cease to be skilled artists.

Of all things;-justice is useful then they are useless, and useless when they are useful.

Being just is the virtue of men.