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

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

"The way to build a car is not to put a man in it and tell him to push."

"The problem is not to adjust people to the world they live in, but to adjust the world to the people who live in it."

"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."