A wise man gets more use from his enemies than a fool from his friends.

The most and best of us depend on others; we have to live either among friends or among enemies.

Friendship multiplies the good of life and divides the evil.

Never open the door to a lesser evil, for other and greater ones invariably slink in after it.

For the advice in a joke is sometimes more useful than the most serious teaching.

Be first the master of yourself