There are two primary choices in life: to accept conditions as they exist, or accept the responsibility for changing them.

The secret of change is to focus all of your energy, not on fighting the old, but on building the new.

Life would be tragic if it weren't funny.

Turn and face the strange.

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.

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.

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.