Have the courage to take your own thoughts seriously, for they will shape you.

If you want to live a happy life, tie it to a goal, not to people or objects.

Our entire much-praised technological progress, and civilization generally, could be compared to an axe in the hand of a pathological criminal.

Compounding is the 8th wonder of the world.

All conditions and all circumstances in our lives are a result of a certain level of thinking. If we want to change the conditions and circumstances, we have to change the level of thinking that is responsible for it.

It takes a different kind of thinking to solve a problem than the kind of thinking which produced the problem.

I believe my theory of relativity to be true. But it will only be proved for certain in 1981, when I am dead.