...not everyone is willing to defend a position of 'not knowing.' There is no virtue in ignorance for its own sake.

Teachers must learn how to teach ... they need only to be taught more effective ways of teaching.

Behavior is determined by its consequences.

Fame is also won at the expense of others. Even the well-deserved honors of the scientist or man of learning are unfair to many persons of equal achievements who get none. When one man gets a place in the sun, the others are put in a denser shade. From the point of view of the whole group there's no gain whatsoever, and perhaps a loss.

Except when physically restrained, a person is least free or dignified when he is under threat of punishment, and unfortunately most people often are.

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.

I may say that the only differences I expect to see revealed between the behavior of the rat and man (aside from enormous differences of complexity) lie in the field of verbal behavior.