“Experiment is the only means of knowledge at our disposal. Everything else is poetry, imagination.”

“Regarding life, it is much the best to think that the experiences we have are necessary for us. It is by means of experience that we develop and not through our imagination. Imagination is nothing. Explanation is nothing. One can only experience and somehow describe--with, in Camus's phrase, lucid indifference. At the same time, experience is fundamentally illusory. When one is experiencing emotional pain or grief, one feels that everything that happens in life is unreal. And this is a right understanding of life.”

“Our experience of the governments of the world, our knowledge of the weapons at their disposal, and our awareness of our own limitations justify pessimism. But some mysterious factor deep in the human psyche has produced a countervailing conviction that educating, organizing, uniting, and acting will make a difference. ”

“Poetry is the shadow cast by our streetlight imaginations.”

“I have always been faithful to you if faithful means the experience against which everything else has been measured.”

“The only source of knowledge is experience.”