The most necessary learning is that which unlearns evil.
To all my friends without distinction I am ready to display my opulence: come one, come all; and whosoever likes to take a share is welcome to the wealth that lies within my soul.
Royalty does good and is badly spoken of.
Not to unlearn what you have learned is the most necessary kind of learning.
Observe your enemies, for they first find out your faults.
When brothers agree, no fortress is so strong as their common life.