Niels Bohr Quotes

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About Niels Bohr

Niels Henrik David Bohr (1885-1962) was a Danish physicist who made significant contributions to our understanding of atomic structure and quantum mechanics. Born on October 7, 1885, in Copenhagen, Denmark, he was the son of Christian Bohr, a renowned physiologist, and Ellen Adler. The intellectual atmosphere at home, with regular visits from distinguished scholars, nurtured Niels' curiosity from an early age. In 1903, Bohr earned his entrance scholarship to the University of Copenhagen, where he studied physics under Professor Eugen Lorentz and graduated in 1911. In 1911, he also married Margrethe Norlund, a fellow student, with whom he had four sons. Bohr's breakthrough came in 1913 when he proposed the Bohr model of the atom, which offered a quantum mechanical explanation for the structure and spectral lines of atoms. This model incorporated the concept of quantized energy levels, known as orbitals, that an electron could occupy within an atom. In 1922, Bohr was awarded the Nobel Prize in Physics "for his services in the investigation of the structure of atoms and the radiation emanating from them." He then established the Institute for Theoretical Physics in Copenhagen, becoming a center for theoretical physics. In 1930, Bohr introduced his principle of complementarity, suggesting that every physical object or system has multiple compatible descriptions. This concept helped unify quantum mechanics with classical physics. During World War II, Bohr played a crucial role in the development of the Manhattan Project due to his expertise in nuclear physics. Niels Bohr passed away on October 18, 1962, leaving behind an indelible mark on physics and science as a whole. His work continues to influence modern theoretical physics, with his principles being fundamental to our understanding of quantum mechanics and the structure of matter.

Interpretations of Popular Quotes

"Prediction is very difficult, especially about the future."

This quote by Niels Bohr emphasizes that making accurate predictions about the future is challenging, often due to the complexity and unpredictability inherent in many systems, including the natural world and human affairs. It serves as a reminder that our understanding of the universe is always evolving, and humility should be maintained when venturing into the realm of prediction.


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

Niels Bohr's quote suggests that encountering a paradox, or an apparently contradictory or puzzling situation, can be beneficial because it presents an opportunity for growth and advancement in understanding. Paradoxes challenge our conventional thinking and force us to explore new perspectives and ideas, often leading to breakthroughs and progress.


"Anyone who has been part of a discovery knows it bears little resemblance to diligently working out solutions to preconceived problems by following established rules."

This quote by Niels Bohr suggests that breakthrough discoveries often deviate from the traditional process of solving problems within a rigidly defined framework. Instead, they frequently emerge as unexpected outcomes when one is immersed in exploration or investigation without strict adherence to preconceived expectations or rules. Essentially, Bohr emphasizes that true discovery often transcends conventional problem-solving methods and can come from unanticipated avenues.


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

This quote suggests that truth, especially profound or deep truths, can have complex counterparts rather than simply being their negations or opposites. Profound truths often carry multiple layers of meaning, so what appears to be the opposite might still hold a kernel of truth or a different perspective on the original idea. It encourages us to consider and respect complexities in understanding, especially when dealing with profound concepts.


"The more one studies nature, the more convinced one becomes that every single event in nature is deterministic, and yet I am just as convinced that free will is an absolute requirement for any rational interpretation of human behavior."

This quote by Niels Bohr suggests a paradoxical view between the determinism inherent in natural phenomena and the necessity of free will in understanding human behavior. In physics, determinism implies that every event follows fixed laws, but in psychology or sociology, free will refers to individuals' capacity for conscious choice and self-direction. Bohr posits that while nature (physical world) is strictly deterministic, human actions are not, necessitating the concept of free will for a rational interpretation of human behavior. It implies that while we can predict how the universe works based on its laws, human choices remain unpredictable due to the element of free will.


The best weapon of a dictatorship is secrecy, but the best weapon of a democracy should be the weapon of openness.

- Niels Bohr

Weapon, Openness, Should, Secrecy

A physicist is just an atom's way of looking at itself.

- Niels Bohr

Looking, Itself, Atom, Physicist

Humanity will... be confronted with dangers of unprecedented character unless, in due time, measures can be taken to forestall a disastrous competition in such formidable armaments and to establish an international control of the manufacture and use of the powerful materials.

- Niels Bohr

Will, Use, Dangers, Formidable

Technology has advanced more in the last thirty years than in the previous two thousand. The exponential increase in advancement will only continue.

- Niels Bohr

Last, Previous, Advanced, Exponential

When it comes to atoms, language can be used only as in poetry. The poet, too, is not nearly so concerned with describing facts as with creating images.

- Niels Bohr

Poetry, Concerned, Images, Describing

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

- Niels Bohr

Expert, Field, Which, Narrow

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

- Niels Bohr

Truth, Profound, Very, Falsehood

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

- Niels Bohr

Quantum Mechanics, Quantum

While the finish given to our picture of the world by the theory of relativity has already been absorbed into the general scientific consciousness, this has scarcely occurred to the same extent with those aspects of the general problem of knowledge which have been elucidated by the quantum theory.

- Niels Bohr

Scientific, Been, Extent, Quantum

It is wrong to think that the task of physics is to find out how Nature is. Physics concerns what we say about Nature.

- Niels Bohr

Think, How, Task, Concerns

Every sentence I utter must be understood not as an affirmation, but as a question.

- Niels Bohr

Question, Sentence, Utter, Understood

Every description of natural processes must be based on ideas which have been introduced and defined by the classical theory.

- Niels Bohr

Processes, Which, Based, Defined

There are some things so serious you have to laugh at them.

- Niels Bohr

Serious, Some, Things, Laugh

Einstein, stop telling God what to do!

- Niels Bohr

God, Stop, Telling, Einstein

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

Change, Deep, Own, Order

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

- Niels Bohr

Some, How, Making, Met

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

- Niels Bohr

Thinking, Just, Being, Logical

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

- Niels Bohr

Call, Made, Things, Regarded

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

- Niels Bohr

Think, Never, More, Express Yourself

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

- Niels Bohr

Science, Be True, True, Theory

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

- Niels Bohr

Future, Very, About, Prediction

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