John von Neumann

Computer architecture, game theory

Modern influential 51 sayings

Sayings by John von Neumann

If you say why not bomb them tomorrow, I say why not today? If you say today at five o'clock, I say why not one o'clock?

1950 — Regarding nuclear war strategy
Controversial Unverifiable

There's no sense in being precise when you don't even know what you're talking about.

1950s — Attributed saying
Controversial Confirmed

Anyone who considers arithmetical methods of producing random digits is, of course, in a state of sin.

1951 — Lecture notes or informal remarks, highlighting the difficulty of true randomness from deterministic…
Humorous Unverifiable

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

1930s-1950s — Anecdote recounted by several mathematicians, including Paul Halmos.
Humorous Confirmed

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

1940s-1950s — Attributed to him by various sources.
Humorous Confirmed

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 some verbal interpretations, describes observed phenomena. The justification of such a mathematical construct is solely and precisely that it is expected to work.

1955 — From his essay 'Method in the Physical Sciences'.
Humorous Unverifiable

As far as I'm concerned, the two most important things in life are mathematics and sex.

1940s-1950s — Reported by several biographers as a personal, informal remark.
Humorous Unverifiable

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 a mathematician to do his dirty work.

1940s-1950s — A humorous quip, often recounted in scientific circles.
Humorous Unverifiable

The computer is the only machine that can be taught to do anything.

1950s — Interview or lecture, expressing his vision for computing.
Humorous Unverifiable

The game of life is a game of perfect information.

1940s — Referring to his work on game theory.
Humorous Unverifiable

Mathematics is not a science. It is a language.

1940s-1950s — A perspective he often shared about the nature of mathematics.
Humorous Unverifiable

The more precisely the position is determined, the less precisely the momentum is known in this instant, and vice versa.

1930s — Referring to Heisenberg's Uncertainty Principle, a concept he engaged with.
Humorous Unverifiable

The problems of mathematics are not in mathematics itself, but in the human mind.

1940s-1950s — A philosophical remark on the nature of mathematical difficulty.
Humorous Unverifiable

It would appear that we have reached the limits of what it is possible to achieve with computer technology, although one should be careful with such statements, as they tend to sound pretty silly in 5 years.

N/A — Often misattributed to him, it is actually a common paraphrase or urban legend. It is unlikely he sa…
Humorous Unverifiable

An honest man is one who is afraid of the police.

1940s-1950s — A cynical and humorous remark, reflecting his pragmatic view of human nature.
Humorous Unverifiable

The greatest value of a picture is when it forces us to notice what we never expected to see.

1966 (posthumously published) — From his 'Theory of Self-Reproducing Automata'.
Humorous Unverifiable

When we look at the results of computation, we don't always know what they mean.

1950s — Reflecting on the challenges of interpreting complex computational outputs.
Humorous Unverifiable

The world is so complicated that it cannot be described in any other way than by itself.

1950s — A philosophical statement about the irreducible complexity of reality.
Humorous Unverifiable

The more abstract a thing is, the more real it is.

1940s-1950s — A remark reflecting his Platonist leanings in mathematics.
Humorous Unverifiable

It is not at all certain that the mathematical method is appropriate for the description of the world.

1950s — A surprising statement from a mathematician, expressing a degree of humility.
Humorous Unverifiable