The real scientist is ready to bear privation and, if need be, starvation rather than let anyone dictate to him which direction his work must take.

The key to happiness is not to get more, but to enjoy what we have and to fill the empty frame of our lives instead of enlarging it.

Research is not a systematic occupation but an intuitive artistic vocation.

We are all but recent leaves on the same old tree of life and if this life has adapted itself to new functions and conditions, it uses the same old basic principles over and over again. There is no real difference between the grass and the man who mows it.

Here we stand in the middle of this new world with our primitive brain, attuned to the simple cave life, with terrific forces at our disposal, which we are clever enough to release, but whose consequences we cannot comprehend.

Discovery consists of looking at the same thing as everyone else and thinking something different.

Research is to see what everybody else has seen, and to think what nobody else has thought.