Naivete in grownups is often charming; but when coupled with vanity it is indistinguishable from stupidity.

Facts are counterrevolutionary.

The leader has to be practical and a realist, yet must talk the language of the visionary and the idealist.

The chemistry of dissatisfaction is as the chemistry of some marvelously potent tar. In it are the building stones of explosives, stimulants, poisons, opiates, perfumes and stenches.

When cowardice is made respectable, its followers are without number both from among the weak and the strong; it easily becomes a fashion.

Children, savages and true believers remember far less what they have seen than what they have heard.

One word characterizes the most strenuous of the efforts for the advancement of science that I have made perservereingly during fifty-five years; that word is failure