Werner Heisenberg

The more precisely the position is determined, the less precisely the momentum is known, and conversely.

What we observe is not nature itself, but nature exposed to our method of questioning.

The reality we can put into words is never reality itself.

Every tool carries with it the spirit by which it has been created.

An expert is someone who knows some of the worst mistakes that can be made in his subject and who manages to avoid them.

The first gulp from the glass of natural sciences will turn you into an atheist, but at the bottom of the glass God is waiting for you.

I think that the most important task of science is to teach us to think correctly.

Nature is under no obligation to conform to our preconceived notions.

The universe is infinite in all directions, so there's no beginning or end.

In the history of physics, there comes a time when the deformation of concepts reaches a point where one has to ask whether the deformation is still worth the effort.

Quantum theory does not bring us any closer to the secret of the Old One. I, at any rate, am convinced that He does not throw dice.

The laws of nature are but the mathematical thoughts of God.

It is probably true quite generally that in the history of human thinking the most fruitful developments frequently take place at those points where two different lines of thought meet.

The existing scientific concepts cover always only a very limited part of reality, and the other part that has not yet been understood is infinite.

Natural science does not simply describe and explain nature; it is part of the interplay between nature and ourselves.

The solution of the difficulty is that the two mental pictures which experiment lead us to form - the one of the particles, the other of the waves - are both incomplete and have only the validity of analogies which are accurate only in limiting cases.

We have to remember that what we observe is not nature in itself but nature exposed to our method of questioning.

Every word or concept, clear as it may seem to be, has only a limited range of applicability.

The void is ready to catch whatever is thrown into it.

In dreams we see ourselves as our natures ought to be perfected.