"The world needs men who can think for themselves, and not just repeat what they have been taught."

"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.…"

"The quantum hypothesis will never be understood until one realizes that it is only a provisional stopgap."

"The human spirit is capable of reaching for the stars."

"The pioneer in a new field of knowledge is never a popular man."