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

Life would be tragic if it weren't funny.

People won't have time for you if you are always angry or complaining.

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

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.