I saw him open his mouth wide. . . as though he had wanted to swallow all the air, all the earth, all the men before him.

Some great men owe most of their greatness to the ability of detecting in those they destine for their tools the exact quality of strength that matters for their work.

Mathematics commands all my respect, but I have no use for engines.

Being myself animated by feelings of affection toward my fellowmen, I am saddened by the modern system of advertising. Whatever evidence it offers of enterprise, ingenuity, impudence, and resource in certain individuals, it proves to my mind the wide prevalence of that form of mental degradation which is called gullibility.

They were conquerors, and for that you want only brute force--nothing to boast of, when you have it, since your strength is just an accident arising from the weakness of others.

But his soul was mad. Being alone in the wilderness, it had looked within itself and, by heavens I tell you, it had gone mad.

Only in men's imagination does every truth find an effective and undeniable existence. Imagination, not invention, is the supreme master of art as of life.