Our lives are universally shortened by our ignorance.

The freest form of government is only the least objectionable form. The rule of the many by the few we call tyranny: the rule of the few by the many is tyranny also; only of a less intense kind.

If a single cell, under appropriate conditions, becomes a man in the space of a few years, there can surely be no difficulty in understanding how, under appropriate conditions, a cell may, in the course of untold millions of years, give origin to the human race.

The preservation of health is a duty. Few seem conscious that there is such a thing as physical morality.

Agnostics are people who, like myself, confess themselves to be hopelessly ignorant concerning a variety of matters, about which metaphysicians and theologians, both orthodox and heterodox, dogmatize with the utmost confidence.

When men hire themselves out to shoot other men to order, asking nothing about the justice of their cause, I don't care if they are shot themselves.

Education has for its object the formation of character.