If you can’t explain it simply, you don’t understand it well enough.

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.

Education is what remains after one has forgotten what one has learned in school.

Force always attracts men of low morality.

God always takes the simplest way.

Gravitation is not responsible for people falling in love.

God may be subtle, but he isn’t plain mean.

I believe that a simple and unassuming manner of life is best for everyone, best both for the body and the mind.

I do not believe in the God of theology who rewards good and punishes evil.

I never think of the future – it comes soon enough.

If people are good only because they fear punishment, and hope for reward, then we are a sorry lot indeed.

Imagination is everything. It is the preview of life’s coming attractions.

Information is not knowledge.

Intellectual growth should commence at birth and cease only at death.

Isn’t it strange that I who have written only unpopular books should be such a popular fellow?

Intellectuals solve problems, geniuses prevent them.

It is a miracle that curiosity survives formal education.

It is the supreme art of the teacher to awaken joy in creative expression and knowledge.

It should be possible to explain the laws of physics to a barmaid.