Niels Bohr

The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth.

No, no, you're not thinking; you're just being logical.

Never express yourself more clearly than you are able to think.

We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct. My own feeling is that it is not crazy enough.

If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.

Oh what idiots we have all been, this is just as it must be

There are two sorts of truth: trivialities, where opposites are clearly absurd, and profound truths, recognised by the fact that the opposite is also a profound truth

In physics we deal with states of affairs much simpler than those of psychology and yet we again and again learn that our task is not to investigate the essence of things-we do not at all know what this would mean&mash;but to develop those concepts that allow us to speak with each other about the events of nature in a fruitful manner.

Truth and clarity are complementary.

What is that we human beings ultimately depend on? We depend on our words. We are suspended in language. Our task is to communicate experience and ideas to others.

If you aren't confused by quantum mechanics, you haven't really understood it.

The meaning of life consists in the fact that it makes no sense to say that life has no meaning.