You insist that there is something a machine cannot do. If you tell me precisely what it is a machine cannot do, then I can always make a machine which will do just that. John von Neumann

If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is. John von Neumann

Anyone who attempts to generate random numbers by deterministic means is, of course, living in a state of sin. John von Neumann

There’s no sense in being precise when you don’t even know what you’re talking about. John von Neumann

In mathematics you don’t understand things. You just get used to them. John von Neumann

The sciences do not try to explain, they hardly even try to interpret, they mainly make models. By a model is meant a mathematical construct which, with the addition of certain verbal interpretations, describes observed phenomena. The justification of such a mathematical construct is solely and precisely that it is expected to work. John Von Neumann