I am sadly afraid that I must have done some wicked thing.
We must not contradict, but instruct him that contradicts us; for a madman is not cured by another running mad also.
Observe your enemies, for they first find out your faults.
The most useful piece of learning for the uses of life is to unlearn what is untrue.
Royalty does good and is badly spoken of.
The most necessary learning is that which unlearns evil.