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

"Contingencies of reinforcement are everywhere."

"I am not an atheist; I am a behaviorist."

"I am sometimes accused of having left something out of account in my analysis of human behavior, and I usually admit it. I have left out the mind."

"The only way to tell whether a given event is reinforcing to a given organism under given conditions is to make a direct test."