We weed out the darnel from the corn and the unfit in war, but do not excuse evil men from the service of the state.
The most necessary learning is that which unlearns evil.
Observe your enemies, for they first find out your faults.
There are only two people who can tell you the truth about yourself - an enemy who has lost his temper and a friend who loves you dearly.
Wealth and poverty do not lie in a man's estate, but in men's souls.
The advantages of philosophy? That I am able to hold converse with myself.