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.
As rust corrupts iron, so envy corrupts man.
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.
Observe your enemies, for they first find out your faults.
The investigation of the meaning of words is the beginning of education.