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

A physicist is just an atom’s way of looking at itself.
- Niels Bohr

Everything we call real is made of things that cannot be regarded as real.
- Niels Bohr

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