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

Truth is what stands the test of experience.

The strength of the Constitution lies entirely in the determination of each citizen to defend it. Only if every single citizen feels duty bound to do his share in this defense are the constitutional rights secure.

Without the sense of fellowship with men of like mind, of preoccupation with the objective, the eternally unattainable in the field of art and scientific research, life would have seemed to me empty.

The goal of pacifism is possible only though a supranational organization. To stand unconditionally for this cause is the criterion of true pacifism.

I see my life in terms of music.

I urge a willingness to reserve a place in rational science for non-rational wonder.