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

Ignorance, the root and stem of all evil.

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

Intelligence is the ability to adapt to change.

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

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

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.