In my experience, the best creative work is never done when one is unhappy.

If I had an hour to solve a problem I'd spend 55 minutes thinking about the problem and 5 minutes thinking about solutions.

Hunger, love, pain, fear are some of those inner forces which rule the individual's instinct for self preservation.

Never regard study as a duty, but as the enviable opportunity to learn

The pioneers of a warless world are the young men (and women) who refuse military service.

... the desire for truth must take precedence over all other desires.

The most important method of education always has consisted of that in which the pupil was urged to actual performance.