Niels Bohr — "Physics is an attempt to describe the world, and it is impossible to describe th…"
Physics is an attempt to describe the world, and it is impossible to describe the world without describing ourselves.
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More from Niels Bohr
"The scientist's greatest reward is the joy of discovery."
"Light and justice are two sides of the same coin."
"Your theory is crazy, but it's not crazy enough to be true."
"There are trivial truths and great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true."
"The task is not so much to see what no one has yet seen, but to think what nobody has yet thought, about that which everybody sees."
Details
From his philosophical reflections on the role of the observer in quantum mechanics.
Date: Mid 20th century
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Understanding this quote
What it means
Science cannot be separated from the scientist. When we study the physical world, our tools, perceptions, and consciousness inevitably shape what we observe and how we understand it. The observer is never truly outside the system being studied. Knowledge of the universe is inseparable from self-knowledge — studying nature is simultaneously studying the nature of human perception and thought.
Relevance to Niels Bohr
Bohr pioneered quantum mechanics and the Copenhagen interpretation, which placed the observer at the center of measurement. His atomic model and complementarity principle directly challenged classical physics' assumption of a detached, objective observer. Bohr spent decades arguing that the act of measurement disturbs quantum systems, making the physicist an inextricable part of any physical description — this quote is the philosophical core of his life's work.
The era
Bohr worked through quantum mechanics' revolutionary 1920s-1930s birth, when physics shattered centuries of Newtonian certainty. Einstein's relativity already upended absolute space and time. Quantum mechanics went further, suggesting reality itself was probabilistic and observer-dependent. This era forced physicists to confront philosophy: what does 'objective reality' even mean? Bohr's insight captured the profound epistemological crisis reshaping science and human self-understanding simultaneously.
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