Throughout my career, nervousness and stage-fright have never left me before playing. And each of the thousands of concerts I have played at, I feel as bad as I did the very first time.

The person who works and is never bored is never old. Work and interest in worthwhile things are the best remedy for age.

Man has made many machines, complex and cunning, but which of them indeed rivals the workings of his heart?

Say things to the world that are true.

The situation is hopeless, we must take the next step.

Each second we live is a new and unique moment of the universe; a moment that never was before and never will be again.

One should be able to say to our children: You are a marvel! You are unique. In all the world, there is no other child exactly like you. In the millions of years that have passed, there has never been another child like you! ... and when you grow up, can you harm another who is, like you, a marvel?