The only true wisdom is in knowing you know nothing.

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

Ignorance, the root and stem of all evil.

Life would be tragic if it weren't funny.

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

People who boast about their I.Q. are losers.

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

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

We should seek the greatest value of our action.