The epitaphs on tombstones of a great many people should read: Died at thirty, and buried at sixty.

The analytical geometry of Descartes and the calculus of Newton and Leibniz have expanded into the marvelous mathematical method

Optimism is essential to achievement and it is also the foundation of courage and true progress.

I divide the world into three Classes - The few who make things happen, the many who watch things happen, the overwhelming majority who have no notion of what happens.

America is the best half-educated country in the world.

An expert is one who knows more and more about less and less.

The old world order changed when this war-storm broke. The old international order passed away as suddenly, as unexpectedly, and as completely as if it had been wiped out by a gigantic flood, by a great tempest, or by a volcanic eruption. The old world order died with the setting of that day's sun and a new world order is being born while I speak, with birth-pangs so terrible that it seems almost incredible that life could come out of such fearful suffering and such overwhelming sorrow.