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.

Where there is shouting, there is no true knowledge.

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

The most important knowledge is that which guides the way you lead your life.

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.