Since the mathematicians have invaded the theory of relativity I do not understand it myself any more.

The ideas that have lighted my way have been kindness, beauty and truth.

The most important decision we make is whether we believe we live in a friendly or hostile universe.

Out of the multitude of our sense experiences we take, mentally and arbitrarily, certain repeatedly occurring complexes of sense impression (partly in conjunction with sense impressions which are interpreted as signs for sense experiences of others), and we attribute to them a meaning the meaning of the bodily object.

One does not make wars less likely by formulationg rules of warfare... war cannot be humanized. It can only be eliminated.

It is the same with people as it is with riding a bike. Only when moving can one comfortably maintain one's balance.

Desire for approval and recognition is a healthy motive, but the desire to be acknowledged as better, stronger, or more intelligent than a fellow being or fellow scholar easily leads to an excessively egoistic psychological adjustment, which may become injurious for the individual and for the community.