Better contraceptives will control population only if people will use them. A nuclear holocaust can be prevented only if the conditions under which nations make war can be changed. The environment will continue to deteriorate until pollution practices are abandoned. We need to make vast changes in human behavior.

It is not a question of starting. The start has been made. It's a question of what's to be done from now on.

Indeed one of the ultimate advantages of an education is simply coming to the end of it.

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

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

What is love except another name for the use of positive reinforcement? Or vice versa.

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