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.

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.

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.