To say that... behaviors have different 'meanings' is only another way of saying that they are controlled by different variables.

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.

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.

Going out of style isn't a natural process, but a manipulated change which destroys the beauty of last year's dress in order to make it worthless.

The mob rushes in where individuals fear to tread.

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.

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