It takes a touch of genius - and a lot of courage to move in the opposite direction.

When forced to summarize the general theory of relativity in one sentence: Time and space and gravitation have no separate existence from matter.

Remember today, for it is the beginning of always. Today marks the start of a brave new future filled with all your dreams can hold. Think truly to the future and make those dreams come true.

Games are the most elevated form of investigation.

Creating a new theory is not like destroying an old barn and erecting a skyscraper in its place. It is rather like climbing a mountain, gaining new and wider views, discovering unexpected connections between our starting points and its rich environment. But the point from which we started out still exists and can be seen, although it appears smaller and forms a tiny part of our broad view gained by the mastery of the obstacles on our adventurous way up.

I do know that kind fate allowed me to find a couple of nice ideas after many years of feverish labor.

The tragedy of life is what dies in the hearts and souls of people while they live.