The extent to which human aggression exemplifies innate tendencies is not clear.

The simplest and most satisfactory view is that thought is simply behavior - verbal or nonverbal, covert or overt. It is not some mysterious process responsible for behavior but the very behavior itself in all the complexity of its controlling relations.

A scientist may not be sure of the answer, but he's often sure he can find one. And that's a condition which is clearly not enjoyed by philosophy.

A permissive government is a government that leaves control to other sources.

Science, not religion, has taught me my most useful values, among them intellectual honesty. It is better to go without answers than to accept those that merely resolve puzzlement.

The consequences of an act affect the probability of its occurring again.

Problem-solving typically involves the construction of discriminative stimuli