The advantages of philosophy? That I am able to hold converse with myself.
When brothers agree, no fortress is so strong as their common life.
The most useful piece of learning for the uses of life is to unlearn what is untrue.
Observe your enemies, for they first find out your faults.
As iron is eaten away by rust, so the envious are consumed by their own passion.
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.