John von Neumann — "I am not a great mathematician; I am merely a good one."

"I'm told that the only difference between a mathematician and a physicist is that a mathematician thinks about mathematics and a physicist thinks about physics. And a physicist is always trying to get…"

"The computer is a universal machine. It can do anything that can be described algorithmically."

"Young man, in mathematics you don't understand things. You just get used to them."

"I am thinking about something much more important than bombs. I am thinking about computers."

"It is not a question of whether we will be able to build a computer that can think. It is a question of whether we will be able to build a computer that can think as fast as we do."