"The way positive reinforcement is carried out is more important than the amount."

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

"The concept of 'mind' is a verbal invention, an explanatory fiction."

"The science of behavior is not interested in what goes on inside the organism, but in what the organism does."

"The real question is not whether machines think but whether men do."