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

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

Turn and face the strange.

You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete.

I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.

Intelligence without ambition is a bird without wings.

If you think we can't change the world, it just means you're not one of those what will.

No matter what people tell you, words and ideas can change the world.

We should seek the greatest value of our action.