Man is very well defended against himself... The actual fortress is inaccessible, even invisible to him, unless his friends and enemies play the traitor and conduct him in by a secret path.

Friends must always be treated as if one day they might be enemies.

I am slow to listen to criminations among friends, and never espouse their quarrels on either side. My sincere wish is that both sides will allow bygones to be bygones.

Never make friends with people who are above or below you in status. Such friendships will never give you any happiness.

I have friends in overalls whose friendship I would not swap for the favor of the kings of the world.

I like friends who have independent minds because they tend to make you see problems from all angles.