Nothing is more intolerable than to have to admit to yourself your own errors.

Courage, above all things, is the first quality of a warrior.

If we know exactly where we're going, exactly how to get there, and exactly what we'll see along the way, we won't learn anything.

A person reveals his character by nothing so clearly as the joke he resents.

I wanted to change the world. But I have found that the only thing one can be sure of changing is oneself.

A house divided against itself cannot stand.

Drop the idea that you are Atlas carrying the world on your shoulders. The world would go on even without you. Don't take yourself so seriously.

Half the world is composed of people who have something to say and can't, and the other half who have nothing to say and keep on saying it.

I think about the meaning of pain. Pain is personal. It really belongs to the one feeling it. Probably the only thing that is your own. I like mine.

It is a cliche that most cliches are true, but then like most cliches, that cliche is untrue.

Intelligence is the ability to adapt to change.

There are two educations. One should teach us how to make a living and the other how to live.

The place where you made your stand never mattered. Only that you were there...and still on your feet.

There is no question climate change is happening. The only arguable point is what part humans are playing in it.

Let him who would move the world first move himself.

Honesty is the first chapter in the book of wisdom.

You are the bows from which your children as living arrows are sent forth.

It is always advisable to perceive clearly our ignorance.

The noblest pleasure is the joy of understanding.

The greatest minds are capable of the greatest vices as well as of the greatest virtues.

Thought can be so seductive and hypnotic that it absorbs your attention totally, so you become your thoughts.