The investigation of the meaning of words is the beginning of education.
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.
We must not contradict, but instruct him that contradicts us; for a madman is not cured by another running mad also.
Royalty does good and is badly spoken of.
The most necessary learning is that which unlearns evil.
Observe your enemies, for they first find out your faults.