"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."

"Education is what survives when what has been learned has been forgotten."

"The rat's behavior is lawful, and by lawful I mean it can be predicted and controlled."

"The way in which we think about the causes of human behavior has changed in a way that suggests that we are at an early stage of a scientific revolution."

"Contingencies of reinforcement are everywhere."