"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."

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

"The baby is an exquisite instrument, and we must learn to play it properly."

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

"The environment not only goads or releases, it selects."