"The constant changes in the scientific worldview show how important it is to remain open to new ideas."

"I am convinced that the world is governed by laws of a mathematical nature."

"The man who has not passed through the bitter experience of doubt, has not made a single step forward in science."

"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 total number of particles in the universe is so large that it is impossible to count them."