The leader is one who, out of the clutter, brings simplicity... out of discord, harmony... and out of difficulty, opportunity.

By academic freedom I understand the right to search for truth and to publish and teach what one holds to be true. This right also implies a duty: one must not conceal any part of what one has recognized to be true.

Let every man judge according to his own standards, by what he has himself read, not by what others tell him.

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

Anybody who really wants to abolish war must resolutely declare himself in favor of his own country's resigning a portion of sovereignty in place of international institutions.

Freedom of teaching and of opinion in book or press is the foundation for the sound and natural development of any people.

But nature did not deem it her business to make the discovery of her laws easy for us.