It is my conviction that killing under the cloak of war is nothing but an act of murder.

Germany had the misfortune of becoming poisoned, first because of plenty, and then because of want.

There is no greater satisfaction for a just and well-meaning person than the knowledge that he has devoted his best energies to the service of the good cause.

Strange is our situation here upon earth.

But there is another reason for the high repute of mathematics: it is mathematics that offers the exact natural sciences a certain measure of security which, without mathematics, they could not attain.

Classical thermodynamics ... is the only physical theory of universal content which I am convinced ... will never be overthrown.

Stupidity is a personal achievement which transcends national boundaries.