Truth will not make us rich, but it will make us free.

In progressive societies the concentration[of wealth] may reach a point where the strength of number in the many poor rivals the strength of ability in the few rich; then the unstable equilibrium generates a critical situation, which history has diversely met by legislation redistributing wealth or by revolution distributing poverty.

No man who is in a hurry is quite civilized.

If man asks for many laws it is only because he is sure that his neighbor needs them; privately he is an unphilosophical anarchist, and thinks laws in his own case superfluous.

Civilization is not inherited; it has to be learned and earned by each generation anew; if the transmission should be interrupted for one century, civilization would die, and we should be savages again.

In the last analysis civilization is based upon the food supply.

Progress is the increasing control of the environment by life.