The only path by which another person can upset you is through your own thought.

Anyone who has never made a mistake has never tried anything new.

Everything you can imagine is real.

Part of me suspects that I'm a loser, and the other part of me thinks I'm God Almighty.

Reality leaves a lot to the imagination.

A clever person solves a problem. A wise person avoids it.

Insanity is doing the same thing over and over again and expecting different results.

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

The highest possible stage in moral culture is when we recognise that we ought to control our thoughts.