If men as individuals surrender to the call of their elementary instincts, avoiding pain and seeking satisfaction only for their own selves, the result for them all taken together must be a state of insecurity, of fear, and of promiscuous misery.

Peace cannot be kept by force; it can only be achieved by understanding.

The human mind has first to construct forms, independently, before we can find them in things.

To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.

If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut

Curiosity is a delicate little plant that, aside from stimulation, stands mainly in need of freedom.

Any fool can know. The point is to understand.