When you trip over love, it is easy to get up. But when you fall in love, it is impossible to stand again.

Although I tried to be universal in thought, I am European by instinct and inclination.

There is not the slightest indication that nuclear energy will ever be obtainable. It would mean that the atom would have to be shattered at will.

I cannot imagine a God who rewards and punishes the objects of his creation and is but a reflection of human frailty.

I never teach my pupils, I only attempt to provide the conditions in which they can learn.

My internal and external life depend so much on the work of others that I must make an extreme effort to give as much as I receive.

It was the experience of mystery - even if mixed with fear - that engendered religion.