Think good, and good follows. Think evil, and evil follows. You are what you think all day long.

Thinking is the talking of the soul with itself.

Happiness is when what you think, what you say, and what you do are in harmony.

The secret to happiness is low expectations.

Do I not destroy my enemies when I make them my friends?

Any idea, plan, or purpose may be placed in the mind through repetition of thought.

Books serve to show a man that those original thoughts of his aren't very new after all.

Better to remain silent and be thought a fool than to speak out and remove all doubt.

He can who thinks he can, and he can't who thinks he can't. This is an inexorable, indisputable law.