Man is the only 150 pound nonlinear servomechanism that can be wholly reproduced by unskilled labor.

To admit ignorance is to exhibit wisdom.

It is work, work that one delights in, that is the surest guarantor of happiness. But even here it is a work that has to be earned by labor in one's earlier years. One should labor so hard in youth that everything one does subsequently is easy by comparison.

By virtue of being born to humanity, every human being has a right to the development and fulfillment of his potentialities as a human being.

The idea is to die young as late as possible.

... the main principle by which human beings must guide the future course of their development is love.

Psychosclerosis: the hardening of the attitude which causes a person to cease dreaming, seeing, thinking, and leading.