Nothing exists until it is measured.

- Niels Bohr

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

- Niels Bohr

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

- Niels Bohr

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

- Niels Bohr

A deep truth is a truth so deep that not only is it true but it's exact opposite is also true.

- Niels Bohr

When we measure something we are forcing an undetermined, undefined world to assume an experimental value. We are not measuring the world, we are cre…

- Niels Bohr

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

- Niels Bohr

Prediction is very difficult, especially if it's about the future.

- Niels Bohr

Opposites are not contradictory but complementary.

- Niels Bohr