Royalty does good and is badly spoken of.
Observe your enemies, for they first find out your faults.
The most necessary learning is that which unlearns evil.
The most useful piece of learning for the uses of life is to unlearn what is untrue.
The advantages of philosophy? That I am able to hold converse with myself.
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.