Whether a man lives or dies in vain can be measured only by the way he faces his own problems, by the success or failure of the inner conflict within his own soul. And of this no one may know save God.

Each honest calling, each walk of life, has its own elite, its own aristocracy based on excellence of performance. . . . There will always be the false snobbery which tries to place one vocation above another. You will become a member of the aristocracy in the American sense only if your accomplishments and integrity earn this appellation.

Whether a man lives or dies in vain can be measured only by the way he faces his own problems, by the success or failure of the inner conflict within his own soul. And of this no one may know save God.

Even the development of the steam engine owed but little to the advancement of science.

Behold the turtle. He makes progress only when he sticks his neck out.

Some of mankind's most terrible misdeeds have been committed under the spell of certain magic words or phrases.

Science advances, not by the accumulation of new facts, but by the continuous development of new concepts.