A permissive government is a government that leaves control to other sources.

Chaos breeds geniuses. It offers a man something to be a genius about.

A failure is not always a mistake, it may simply be the best one can do under the circumstances. The real mistake is to stop trying.

The consequences of an act affect the probability of its occurring again.

It has always been the task of formal education to set up behavior which would prove useful or enjoyable later in a student's life.

A first principle not formally recognized by scientific methodologists: when you run into something interesting, drop everything else and study it.

If you're old, don't try to change yourself, change your environment.