Genius, as an explosive power, beats gunpowder hollow.
The great thing in the world is not so much to seek happiness as to earn peace and self-respect.
Of the few innocent pleasures left to men past middle life, the jamming of common sense down the throats of fools is perhaps the keenest.
There is the greatest practical benefit in making a few failures early in life.
Only a scientific people can survive in a scientific future.
The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals.