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 real question is not whether machines think but whether men do. The mystery which surrounds a thinking machine already surrounds a thinking man.

At this very moment enormous numbers of intelligent men and women of goodwill are trying to build a better world. But problems are born faster than they can be solved.

A person who has been punished is not thereby simply less inclined to behave in a given way; at best, he learns how to avoid punishment.

We do not choose survival as a value, it chooses us.

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

Many instructional arrangements seem "contrived," but there is nothing wrong with that. It is the teacher's function to contrive conditions under which students learn. 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.