Science is a systematic means of gaining reliable knowledge.

The primary ineluctable facts of the birth and death of each one of the constituent members in a social group determine the necessity of education.

To feel the meaning of what one is doing, and to rejoice in that meaning; to unite in one concurrent fact the unfolding of the inner life and the ordered development of material conditions--that is art.

Liberty is not just an idea, an abstract principle. It is power, effective power to do specific things. There is no such thing as liberty in general; liberty, so to speak, at large.

Even when a person is frightened by threats into doing something, the threats work only because the person has an instinct of fear. If he has not, or if, though having it, it is under his own control, the threat has no more influence upon him than light has in causing a person to see who has no eyes.

We always live at the time we live and not at some other time, and only by extracting at each present time the full meaning of each present experience are we prepared for doing the same thing in the future.

Education is life itself.