"Niels Henrik David Bohr" was a Danish physicist who made foundational contributions to understanding atomic structure and old quantum theory/quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research.

Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another. Although the Bohr model has been supplanted by other models, its underlying principles remain valid. He conceived the principle of Complementarity (physics)/complementarity: that items could be separately analysed in terms of contradictory properties, like behaving as a Wave–particle duality/wave or a stream of particles. The notion of complementarity dominated Bohr's thinking in both science and philosophy.

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The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.

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How wonderful that we have met with a paradox. Now we have some hope of making progress.

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An expert is a person who has made all the mistakes that can be made in a very narrow field.

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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.

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

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

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Two sorts of truth: trivialities, where opposites are obviously absurd, and profound truths, recognized by the fact that the opposite is also a profound truth.

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Anyone who is not shocked by quantum theory has not understood it.

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Prediction is very difficult, especially about the future.

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An expert is a man who has made all the mistakes which can be made, in a narrow field.

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

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Your theory is crazy, but it's not crazy enough to be true.

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Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.

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