We should be careful to get out of an experience only the wisdom that is in it - and stop there.

I do not fear death. I had been dead for billions and billions of years before I was born, and had not suffered the slightest inconvenience from it.

It is a good idea to obey all the rules when you're young just so you'll have the strength to break them when you're old.

There's always a hole in theories somewhere if you look close enough.

I am always on the side of the revolutionists, because there never was a revolution unless there were some oppressive and intolerable conditions against which to revolute.

Life is short. Forgive quickly, kiss slowly and love truly.

All you need in this life is ignorance and confidence; then success is sure. You can "already know for sure" things that could actually impede progress. Always be on the lookout for the things you did not know, that you did not know. Secondly, work on strengthening personal belief that a particular will be achieved regardless of any adversity that may show up, or evidence to the contrary.