Be the change that you wish to see in the world.

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

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.

My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all.

Education is the most powerful weapon which you can use to change the world.

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

We should seek the greatest value of our action.