"The goal of psychology is to predict and control behavior."

"Man is a machine in the sense that he is a complex system behaving in lawful ways, but the complexity is extraordinary."

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

"We cannot prove that a man is free, but we can prove that he is not."

"The ultimate aim of the science of behavior is to understand and explain human behavior."