Werner Heisenberg — "Quantum theory does not really describe the behavior of 'things'; it describes t…"
Quantum theory does not really describe the behavior of 'things'; it describes the behavior of 'what we can know' about things.
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More from Werner Heisenberg
"Natural science does not simply describe and explain nature; it is part of the interplay between nature and ourselves."
"The existing scientific concepts cover always only a very limited part of reality, and the other part which has not yet been understood is infinite."
"Can nature possibly be so absurd as it seemed to us in these atomic experiments?"
"The problems of atomic physics are not problems of technology, but problems of philosophy."
"The smallest units of matter are not physical objects in the ordinary sense; they are forms, structures or—in Plato's sense—Ideas."
Details
Interpretive statement about quantum mechanics
Date: Undated, paraphrasing a common interpretation
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Understanding this quote
What it means
Quantum physics isn't a picture of what particles actually are or do on their own. Instead, it's a framework for predicting what measurements and observations will reveal. The theory tracks probabilities, outcomes, and information available to an observer, not an independent reality humming along behind the scenes. Reality at the smallest scale is defined by what can be measured and known, not by hidden objective properties waiting to be uncovered.
Relevance to Werner Heisenberg
Heisenberg built quantum mechanics around observables, famously formulating matrix mechanics in 1925 using only measurable quantities like spectral lines. His 1927 uncertainty principle proved that position and momentum cannot both be precisely known, cementing his view that physics describes knowledge, not hidden reality. This epistemic stance anchored the Copenhagen interpretation he developed with Niels Bohr, and it shaped his lifelong philosophical writings bridging physics with Platonic and Kantian thought.
The era
In the 1920s and 1930s, classical determinism was collapsing. Einstein's relativity had reshaped space and time, and experiments on atoms defied Newtonian intuition. Physicists in Copenhagen, Gottingen, and Munich debated whether science could still claim to describe objective reality. Heisenberg worked amid this upheaval, later continuing under Nazi Germany's strained scientific climate. His insistence that theory tracks knowledge rather than things echoed a broader modernist crisis about observation, certainty, and the limits of human understanding.
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