"No one asks how to motivate a baby. A baby is an inexhaustible source of motivation—for itself."

"The function of a good teacher is to make himself progressively unnecessary."

"Freedom is a matter of contingencies of reinforcement, not of some inner state of mind."

"The truth is, we are all controlled by the world in which we live."

"The future of man is not in the stars but in the control of his own behavior."