"The highest value of human life lies in its service to humanity."

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

"The human mind is a wonderful thing. It starts working the moment you are born and never stops until you stand up to speak in public."

"There can never be any real opposition between religion and science; for the one is the complement of the other."

"Thermodynamics is a funny subject. The first time you go through it, you don't understand it at all. The second time you go through it, you think you understand it, except for one or two small points.…"