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.

The most necessary learning is that which unlearns evil.

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.

Pay attention to your enemies, for they are the first to discover your mistakes.

Not to unlearn what you have learned is the most necessary kind of learning.

To all my friends without distinction I am ready to display my opulence: come one, come all; and whosoever likes to take a share is welcome to the wealth that lies within my soul.

The most useful piece of learning for the uses of life is to unlearn what is untrue.