The only true wisdom is in knowing you know nothing.

There is only one good, knowledge, and one evil, ignorance.

The more I see, the less I know for sure.

Intelligence is the ability to adapt to change.

Life would be tragic if it weren't funny.

Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.

My brain is only a receiver, in the Universe there is a core from which we obtain knowledge, strength and inspiration. I have not penetrated into the secrets of this core, but I know that it exists.

If you can't explain it to a six year old, you don't understand it yourself.

We should seek the greatest value of our action.