If you can't explain something simply, you don't know enough about it.

All that's different about me is that I still ask the questions most people stopped asking at age five.

Outer changes always begin with an inner change of attitude.

I am a determinist. As such, I do not believe in free will...Practically, I am, nevertheless, compelled to act as if freedom of the will existed. If I wish to live in a civilized community, I must act as if man is a responsible being.

"There's been a quantum leap technologically in our age, but unless there's another quantum leap in human relations, unless we learn to live in a new way towards one another, there will be a catastrophe."

One always likes to do the things for which one has ability.

You ask me if I keep a notebook to record my great ideas. I've only ever had one.