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Niels Bohr

From Wikiquote
Thegreat extension of ourexperience in recent years has broughtlight to the insufficiency of our simplemechanical conceptions and, as aconsequence, has shaken the foundation on which the customary interpretation of observation was based.

Niels Henrik David Bohr (7 October1885 –18 November1962) was a Danishphysicist who made foundational contributions to understandingatomic structure andquantum theory, for which he received theNobel Prize in Physics in 1922. Bohr was also aphilosopher and a promoter of scientific research.

Bohr developed theBohr model of theatom, in which he proposed that energy levels ofelectrons are discrete and that the electrons revolve in stable orbits around theatomic nucleus but can jump from one energy level (or orbit) to another. Although the Bohr model has been supplanted by other models, its underlying principles remain valid. He conceived the principle ofcomplementarity: that items could be separately analysed in terms of contradictory properties, like behaving as awave or a stream of particles.

Quotes

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We must beclear that when it comes toatoms,language can be used only as inpoetry.
Theword "reality" is also a word, a word which we must learn to use correctly.
We are all agreed that yourtheory iscrazy. The question that divides us is whether it is crazy enough to have a chance of being correct.
Physics is to be regarded not so much as thestudy of somethinga priori given, but rather as the development of methods of ordering and surveyinghumanexperience.
It iswrong to think that the task of physics is to find out hownatureis. Physics concerns what we cansay about nature...
It is a greatpity thathuman beings cannot find all of theirsatisfaction in scientific contemplativeness.
Some subjects are so serious that one can onlyjoke about them.
Truth andclarity are complementary.
  • Those who are not shocked when they first come across quantum theory cannot possibly have understood it.
    • In a 1952 conversation with Heisenberg and Pauli in Copenhagen; quoted in Heisenberg, Werner,Physics and Beyond. (New York: Harper & Row, 1971) p. 206.
  • We must beclear that when it comes toatoms,language can be used only as inpoetry. The poet, too, is not nearly so concerned with describingfacts as with creating images and establishingmental connections.
    • In his first meeting withWerner Heisenberg in early summer 1920, in response to questions on the nature of language, as reported inDiscussions about Language (1933); quoted inDefense Implications of International Indeterminacy (1972) by Robert J. Pranger, p. 11, andTheorizing Modernism : Essays in Critical Theory (1993) by Steve Giles, p. 28
  • The grand discoveries which scientific experiment yielded at and about the turn of the century, in which investigators in many countries took an eminent part and which were destined all unexpectedly to give us a fresh insight into the structure of atoms, were due in the first instance, as all are aware, to the work of the great investigators of the English school, Sir Joseph Thomson and Sir Ernest Rutherford, who have inscribed their names on the tablets of the history of scientific research as distinguished witnesses to the truth that imagination and acumen are capable of penetrating the crowded mass of registered experience and of revealing Nature's simplicity to our gaze.
    • Niels Bohr's speech at the Nobel Banquet in Stockholm (December 10, 1922)
  • Even the mathematical framework helps nothing, I would first like to understand how Nature avoids the contradictions. (1927)
    • Quoted inWerner Heisenberg: Die Sprache der Atome (2010) by H. Rechenberg, p. 564.
  • The great extension of ourexperience in recent years has brought light to the insufficiency of our simple mechanical conceptions and, as a consequence, has shaken the foundation on which the customary interpretation ofobservation was based.
    • Niels Bohr, "Atomic Physics and the Description of Nature" (1934)
  • Isolated material particles are abstractions, their properties being definable and observable only through their interaction with othersystems.
    • "Atomic Physics and the Description of Nature" (1934)
  • What is it that we humans depend on?We depend on ourwords... Ourtask is tocommunicateexperience andideas to others. We must strive continually to extend the scope of our description, but in such a way that our messages do not thereby lose their objective or unambiguous character ...We are suspended in language in such a way that we cannot say what is up and what is down. The word "reality" is also a word, a word which we mustlearn to use correctly.
    • Quoted inPhilosophy of Science Vol. 37 (1934), p. 157, and inThe Truth of Science : Physical Theories and Reality (1997) by Roger Gerhard Newton, p. 176
  • For a parallel to the lesson of atomic theory regarding the limited applicability of such customary idealizations, we must in fact turn to quite other branches of science, such aspsychology, or even to that kind of epistemological problems with which already thinkers likeBuddha andLao Tzu have been confronted, when trying to harmonize our position as spectators and actors in the great drama of existence.
    • Speech on quantum theory atCelebrazione del Secondo Centenario della Nascita di Luigi Galvani, Bologna, Italy (October 1937)
  • Contraria Sunt Complementa
    • Opposites are complementary.
  • However far the phenomena transcend the scope of classical physical explanation, the account of all evidence must be expressed in classical terms. The argument is that simply by the word "experiment" we refer to a situation where we can tell others what we have done and what we have learned and that, therefore, the account of the experimental arrangement and of the results of the observations must be expressed in unambiguous language with suitable application of the terminology of classical physics.
    • Niels Bohr, "Discussions with Einstein on Epistemological Problems in Atomic Physics," inPaul Arthur Schilpp,Albert Einstein: Philosopher Scientist (1949) pp. 199-241.
  • We are all agreed that your theory is crazy. The question that divides us is whether it is crazy enough to have a chance of being correct.
    • Said toWolfgang Pauli after his presentation ofHeisenberg's and Pauli's nonlinear field theory of elementary particles, at Columbia University (1958), as reported byF. J. Dyson in his paper "Innovation in Physics" (Scientific American, 199, No. 3, September 1958, pp. 74-82; reprinted in "JingShin Theoretical Physics Symposium in Honor of Professor Ta-You Wu," edited by Jong-Ping Hsu & Leonardo Hsu, Singapore; River Edge, NJ: World Scientific, 1998, pp. 73-90, here: p. 84).
    • Your theory is crazy, but it's not crazy enough to be true.
      • As quoted inFirst Philosophy: The Theory of Everything (2007) by Spencer Scoular, p. 89
    • There aremany slight variants on this remark:
      • We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough.
      • We are all agreed that your theory is crazy. The question is whether it is crazy enough to be have a chance of being correct.
      • We in the back are convinced your theory is crazy. But what divides us is whether it is crazy enough.
      • Your theory is crazy, the question is whether it's crazy enough to be true.
      • Yes, I think that your theory is crazy. Sadly, it's not crazy enough to be believed.
  • Physics is to be regarded not so much as the study of somethinga priori given, but rather as the development of methods of ordering and surveying human experience. In this respect our task must be to account for such experience in a manner independent of individual subjective judgement and therefore objective in the sense that it can be unambiguously communicated in ordinary human language.
    • "The Unity of Human Knowledge" (October 1960)
  • Every valuable human being must be a radical and a rebel, for what he must aim at is to make things better than they are.
    • As quoted inThe World of the Atom (1966) by Henry Abraham Boorse and Lloyd Motz, p. 741
  • How wonderful that we have met with a paradox. Now we have some hope of making progress.
    • As quoted inNiels Bohr : The Man, His Science, & the World They Changed (1966) by Ruth Moore, p. 196
  • Two sorts of truth: profound truths recognized by the fact that the opposite is also a profound truth, in contrast to trivialities where opposites are obviously absurd.
    • As quoted by his son Hans Bohr in "My Father", published inNiels Bohr: His Life and Work (1967), p. 328
    • Unsourced variant:The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
    • As quoted inMax Delbrück,Mind from Matter: An Essay on Evolutionary Epistemology, (1986) p. 167.It is the hallmark of any deep truth that its negation is also a deep truth
  • Every sentence I utter must be understood not as an affirmation, but as a question.
    • As quoted inA Dictionary of Scientific Quotations (1991) by Alan L. Mackay, p. 35
  • It is a great pity that human beings cannot find all of their satisfaction in scientific contemplativeness.
    • As quoted inChandra: A Biography of S. Chandrasekhar‎ (1991) by Kameshwar C. Wali, p. 147
  • Anyone who is not shocked by quantum theory has not understood it.
    • As quoted inMeeting the Universe Halfway (2007) by Karen Michelle Barad, p. 254, with a footnote citingThe Philosophical Writings of Niels Bohr (1998).
    • Variants: Those who are not shocked when they first come acrossquantum mechanics cannot possibly have understood it.
      Those who are not shocked when they first come across quantum theory cannot possibly have understood it.
      Anyone who is not shocked by quantum theory has not understood a single word.
      If you think you can talk about quantum theory without feeling dizzy, you haven't understood the first thing about it.
  • Some subjects are so serious that one can only joke about them.
    • As quoted inThe Genius of Science: A Portrait Gallery (2000) by Abraham Pais, p. 24
    • Some things are so serious that one can only joke about them.
      • Variant without any citation as to author inDenial is not a river in Egypt (1998) by Sandi Bachom, p. 85.
  • Truth and clarity are complementary.
    • As quoted inQuantum Theory and the Flight from Realism : Philosophical Responses to Quantum Mechanics (2000) by Christopher Norris, p. 234
  • It is not enough to be wrong, one must also be polite.
    • As quoted inThe Genius of Science: A Portrait Gallery (2000) by Abraham Pais, p. 24
  • Never express yourself more clearly than you are able to think.
    • As quoted inValues of the Wise : Humanity's Highest Aspirations (2004) by Jason Merchey, p. 63
  • Oh, what idiots we all have been. This is just as it must be.
    • In response to Frisch & Meitner's explanation of nuclear fission, as quoted inThe Physicists - A generation that changed the world (1981) by C.P.Snow, p. 96
  • I go into theUpanishads to ask questions.
    • As quoted inGod Is Not One : The Eight Rival Religions That Run the World and Why Their Differences Matter (2010), by Stephen Prothero, Ch, 4 : Hinduism : The Way of Devotion, p. 144
  • No, no, you are not thinking, you are just being logical.
    • In response to those who made purely formal or mathematical arguments, as quoted inWhat Little I Remember (1979) by Otto Robert Frisch, p. 95
  • I am absolutely prepared to talk about the spiritual life of an electronic computer: to state that it is reflecting or is in a bad mood... The question whether the machine really feels or ponders, or whether it merely looks as though it did, is of course absolutely meaningingless.
    • As quoted in a letter written from J. Kalckar to John A. Wheeler dated June 10, 1977, which appears in Wheeler's "Law Without Law," pg 207.

Remarks after the Solvay Conference (1927)

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Thefact thatreligions through the ages have spoken in images,parables, andparadoxes means simply that there are no other ways of grasping thereality to which they refer. But that does not mean that it is not a genuine reality.
Nowadays, theindividual seems to be able tochoose thespiritual framework of histhoughts andactions quite freely, and thisfreedom reflects the fact that the boundaries between the variouscultures andsocieties are beginning to become more fluid. But even when an individual tries to attain thegreatest possible degree ofindependence, he will still be swayed by the existing spiritual structures — consciously or unconsciously.
Religion helps to makesociallife moreharmonious; its most important task is to remind us, in thelanguage of pictures andparables, of the wider framework within which ourlife is set.
Statements of Bohr after the Solvay Conference of 1927, as quoted inPhysics and Beyond (1971) byWerner Heisenberg
  • I feel very much likeDirac: the idea of a personalGod is foreign to me. But we ought to remember thatreligion useslanguage in quite a different way fromscience. The language of religion is more closely related to the language ofpoetry than to the language of science. True, we are inclined to think that science deals with information about objectivefacts, and poetry with subjectivefeelings. Hence we conclude that if religion does indeed deal with objectivetruths, it ought to adopt the same criteria of truth as science. But I myself find the division of theworld into an objective and a subjective side much too arbitrary.The fact that religions through the ages have spoken in images, parables, andparadoxes means simply that there are no other ways of grasping thereality to which they refer. But that does not mean that it is not a genuine reality. And splitting this reality into an objective and a subjective side won't get us very far.
  • I consider those developments inphysics during the last decades which have shown how problematical such concepts as "objective" and "subjective" are, a great liberation of thought. The whole thing started with the theory of relativity. In the past, the statement that two events are simultaneous was considered an objective assertion, one that could be communicated quite simply and that was open to verification by any observer. Today we know that 'simultaneity' contains a subjective element, inasmuch as two events that appear simultaneous to an observer at rest are not necessarily simultaneous to an observer in motion. However, the relativistic description is also objective inasmuch as every observer can deduce by calculation what the other observer will perceive or has perceived. For all that, we have come a long way from the classical ideal of objective descriptions.
    Inquantum mechanics the departure from this ideal has been even more radical. We can still use the objectifying language of classical physics to make statements about observable facts. For instance, we can say that a photographic plate has been blackened, or that cloud droplets have formed. But we can say nothing about the atoms themselves. And what predictions we base on such findings depend on the way we pose our experimental question, and here the observer has freedom of choice.Naturally, it still makes no difference whether the observer is a man, an animal, or a piece of apparatus, but it is no longer possible to make predictions without reference to the observer or the means of observation. To that extent, every physical process may be said to have objective and subjective features.The objective world of nineteenth-century science was, as we know today, an ideal, limiting case, but not the whole reality. Admittedly, even in our future encounters with reality we shall have to distinguish between the objective and the subjective side, to make a division between the two. But the location of the separation may depend on the way things are looked at; to a certain extent it can be chosen at will. HenceI can quite understand why we cannot speak about the content of religion in an objectifying language. The fact that different religions try to express this content in quite distinct spiritual forms is no real objection. Perhaps we ought to look upon these different forms as complementary descriptions which, though they exclude one another, are needed to convey the rich possibilities flowing from man's relationship with the central order.
  • Inmathematics we can take our inner distance from the content of our statements. In the final analysis mathematics is a mental game that we can play or not play as we choose. Religion, on the other hand, deals with ourselves, with our life and death; its promises are meant to govern our actions and thus, at least indirectly, our very existence. We cannot just look at them impassively from the outside. Moreover, our attitude to religious questions cannot be separated from our attitude tosociety. Even if religion arose as thespiritual structure of a particular human society, it is arguable whether it has remained the strongest social moldingforce throughhistory, or whether society, once formed, develops new spiritual structures and adapts them to its particular level ofknowledge.Nowadays, theindividual seems to be able tochoose thespiritual framework of histhoughts andactions quite freely, and thisfreedom reflects the fact that the boundaries between the variouscultures andsocieties are beginning to become more fluid. But even when an individual tries to attain thegreatest possible degree ofindependence, he will still be swayed by the existing spiritual structures — consciously or unconsciously. For he, too, must be able to speak oflife anddeath and the human condition to other members of the society in which he's chosen to live; he musteducate hischildren according to the norms of that society, fit into its life. Epistemological sophistries cannot possibly help him attain these ends. Here, too, the relationship between criticalthought about the spiritual content of a given religion and action based on the deliberate acceptance of that content is complementary. And such acceptance, if consciously arrived at, fills the individual with strength ofpurpose, helps him to overcomedoubts and, if he has tosuffer, provides him with the kind of solace that only a sense of being sheltered under an all-embracing roof can grant.In that sense, religion helps to make social life moreharmonious; its most important task is to remind us, in the language of pictures and parables, of the wider framework within which our life is set.


Disputed

[edit]
Stop tellingGod what to do with his dice.
  • Anyone who is not shocked by quantum theory has not understood it.
    • Heisenberg recounts a personal conversation he had with Pauli and Bohr in 1952 in which Bohr says, "Those who are not shocked when they first come across quantum theory cannot possibly have understood it." Heisenberg, Werner,Physics and Beyond. (New York: Harper & Row, 1971) p. 206.
    • Bohr said this sentence in a conversation with Werner Heisenberg, as quoted in: "Der Teil und das Ganze. Gespräche im Umkreis der Atomphysik" . R. Piper & Co., München, 1969, S. 280. DIE ZEIT 22. Aug. 1969[1].
    • As quoted inMeeting the Universe Halfway (2007) by Karen Michelle Barad,p. 254, with the quote attributed toThe Philosophical Writings of Niels Bohr, but with no page number or volume number given.

    • David Mermin, on pages 186–187 of his bookBoojums All the Way Through: Communicating Science in a Prosaic Age (1990) noted that he specifically looked for pithy quotes aboutquantum mechanics along these lines when reviewing the three volumes ofThe Philosophical Writings of Niels Bohr, but couldn't find any:

      Once I tried to teach some quantum mechanics to a class of law students, philosophers, and art historians. As an advertisement for the course I put together the most sensational quotations I could collect from the most authoritative practitioners of the subject. Heisenberg was a goldmine: "The concept of the objective reality of the elementary particles has thus evaporated..."; "the idea of an objective real world whose smallest parts exist objectively in the same sense as stones or trees exist, independently of whether or not we observe them ... is impossible ..." Feynman did his part too: "I think I can safely say that nobody understands quantum mechanics." But I failed to turn up anything comparable in the writings of Bohr. Othersattributed spectacular remarks to him, but he seemed to take pains to avoid any hint of the dramatic in his own writings. You don't pack them into your classroom with "The indivisibility of quantum phenomena finds its consequent expression in the circumstance that every definable subdivision would require a change of the experimental arrangement with the appearance of new individual phenomena," or "the wider frame of complementarity directly expresses our position as regards the account of fundamental properties of matter presupposed in classical physical description but outside its scope."

      I was therefore on the lookout for nuggets when I sat down to review these three volumes – a reissue of Bohr's collected essays on the revolutionary epistemological character of the quantum theory and on the implications of that revolution for other scientific and non-scientific areas of endeavor (the originals first appeared in 1934, 1958, and 1963.) But the most radical statement I could find in all three books was this: "...physics is to be regarded not so much as the study of somethinga priori given, but rather as the development of methods for ordering and surveying human experience." No nuggets for the nonscientist.

    • Variants: Those who are not shocked when they first come across quantum mechanics cannot possibly have understood it.
      Those who are not shocked when they first come across quantum theory cannot possibly have understood it.
      Anyone who is not shocked by quantum theory has not understood a single word.
      If you think you can talk about quantum theory without feeling dizzy, you haven't understood the first thing about it.
  • Prediction is very difficult, especially about thefuture.
    • As quoted inTeaching and Learning Elementary Social Studies (1970) by Arthur K. Ellis, p. 431
    • The above quote is also attributed to various humourists and the Danish poetPiet Hein: "det er svært at spå – især om fremtiden"
    • It is also attributed to Danish cartoonist Storm P (Robert Storm Petersen).
    • Variant: It's hard to make predictions, especially about the future.
  • Stop tellingGod what to do with his dice.
    • A response toEinstein's assertion that "God doesn't play dice"; a similar statement is attributed toEnrico Fermi
    • Variant: Einstein, don't tell God what to do.
    • Variant: Don't tell God what to do with his dice.
    • Variant: You ought not to speak for what Providence can or can not do. – As described inThe Physicists: A generation that changed the world (1981) by C. P. Snow, p. 84
    • In his chapter on the fifth Solvay Conference (1927), biographer Konrad Kleinknecht writes:

      'To his [Einsteins] credo "God does not play dice," Bohr countered, "but it cannot be our task to dictate to God how he should govern the world."'

      Einstein and Heisenberg: The Controversy Over Quantum Physics, Springer Biographies 2019.
  • Of course not ... but I am told it works even if you don'tbelieve in it.
    • Reply to a visitor to his home in Tisvilde who asked him if he really believed a horseshoe above his door brought him luck, as quoted inInward Bound : Of Matter and Forces in the Physical World (1986) by Abraham Pais, p. 210
    • In most published accounts of this anecdote such was Bohr's reply to his friend, but in one early account, inThe Interaction Between Science and Philosophy (1974) by Samuel Sambursky, p. 357, Bohr was at a friend's house and asked "Do you really believe in this?" to which his friend replied "Oh, I don't believe in it. But I am told it works even if you don't believe in it."
    • Variant: No, but I'm told it works even if you don't believe in it.
    • Possibly originated bySamuel Goudsmit

Quotes about Bohr

[edit]
Not often inlife has ahuman being caused me suchjoy by his mere presence as you did. ~Albert Einstein
Iremember discussions with Bohr which went through many hours till very late atnight and ended almost indespair...Cannature possibly be soabsurd as it seemed to us in these atomic experiments? ~Werner Heisenberg
Alphabetized by author
  • We pretend that if I get result +1 here, immediately the photon there is in the state |x>, but if I find -1, immediately the other photon assume[s] another state of polarization... [T]his image is not acceptable forEinstein because it seems as [though] something is goingfaster-than-light. ...It is by this ...reasoning that Einstein said... "If you want to make sense of this correlation at a distance, you have to accept that before they arrive at the measuring apparatus, the particles have already a property determining the outcome." ...Bohr disagreed immediately. ...I don't know anybody who finds Bohr's reply understandable. It's not a joke, what I'm going to say, although it sounds [like] a joke. Bohr is so cautious in his wording that he makes it almost impossible to understand...Bohr insisted oncomplementarity, and at one point he declared... that "Clarity and truth are complementary," and he made all efforts to be as true as possible.
    • Alain Aspect, "The future of quantum technologies: the Second quantum revolution" (Feb 13, 2019)30:30-33:38. @Nokia Bell Labs YouTube channel.
  • Bohr seemed to think that he had solved this question. I could not find his solution in his writings. But there was no doubt that he was convinced that he had solved the problem and, in so doing, had not only contributed to atomic physics, but to epistemology, to philosophy, to humanity in general. And there are astonishing passages in his writings in which he is sort of patronizing to the ancient Far Eastern philosophers, almost saying that he had solved the problems that had defeated them. It's an extraordinary thing for me—the character of Bohr—absolutely puzzling. I like to speak of two Bohrs: one is a very pragmatic fellow who insists that the apparatus is classical, and the other is a very arrogant, pontificating man who makes enormous claims for what he has done.
  • One of the favorite maxims of my father was the distinction between the two sorts of truths, profound truths recognized by the fact that the opposite is also a profoundtruth, in contrast to trivialities where opposites are obviouslyabsurd.
    • Hans Henrik Bohr, writing about his father in "My father" inNiels Bohr - His Life and Work As Seen By His Friends and Colleagues (1967), S. Rozental, ed.
  • If quantum theory has any philosophical importance at all, it lies in the fact that it demonstrates for a single, sharply defined science the necessity of dual aspects and complementary considerations. Niels Bohr has discussed this question with respect to many applications in physiology, psychology, and philosophy in general.
  • It is practically impossible to describe Niels Bohr to a person who has never worked with him. Probably his most characteristic property was the slowness of his thinking and comprehension. When, in the late twenties and early thirties, the author of this book was one of the "Bohr boys" working in his Institute in Copenhagen on a Carlsberg (the best beer in the world!) fellowship, he had many a chance to observe it. In the evening, when a handful of Bohr's students were "working" in the Paa Blegdamsvejen Institute, discussing the latest problems of the quantum theory, or playing Ping-pong on the library table with coffee cups placed on it to make the game more difficult, Bohr would appear, complaining that he was very tired, and would like to "do something." To "do something" inevitably meant to go to the movies, and the only movies Bohr liked were those called The Gun Fight at the Lazy Gee Ranch or The Lone Ranger and a Sioux Girl. But it was hard to go with Bohr to the movies. He could not follow the plot, and was constantly asking us, to the great annoyance of the rest of the audience, questions like this: "Is that the sister of that cowboy who shot the Indian who tried to steal a herd of cattle belonging to her brother-in-law?" The same slowness of reaction was apparent at scientific meetings. Many a time, a visiting young physicist (most physicists visiting Copenhagen were young) would deliver a brilliant talk about his recent calculations on some intricate problem of the quantum theory. Everybody in the audience would understand the argument quite clearly, but Bohr wouldn't. So everybody would start to explain to Bohr the simple point he had missed, and in the resulting turmoil everybody would stop understanding anything. Finally, after a considerable period of time, Bohr would begin to understand, and it would turn out that what he understood about the problem presented by the visitor was quite different from what the visitor meant, and was correct, while the visitor's interpretation was wrong.
    • George Gamow on Niels Bohr in "The Great Physicists from Galileo to Einstein" (1961) pg. 237
  • I remember discussions with Bohr which went through many hours till very late at night and ended almost in despair; and when at the end of the discussion I went alone for a walk in the neighbouring park I repeated to myself again and again the question: Can nature possibly be so absurd as it seemed to us in these atomic experiments?
  • The first thingBohr said to me was that it would only then be profitable to work with him if I understood that he was a dilettante. The only way I knew to react to this unexpected statement was with a polite smile of disbelief. But evidently Bohr was serious. He explained how he had to approach every new question from a starting point of total ignorance.It is perhaps better to say that Bohr's strength lay in his formidable intuition and insight rather than erudition.
    • Abraham Pais, in testimony inNiels Bohr : His Life and Work as Seen by His Friends and Colleagues (1967) edited by Stefan Rozental, p. 218; later in his own work,Niels Bohr's Times : In Physics, Philosophy, and Polity (1991)
  • When asked whether the algorism of quantum mechanics could be considered as somehow mirroring an underlying quantum world, Bohr would answer,"There is no quantum world. There is only an abstract quantum physical description. It is wrong to think that the task of physics is to find out hownatureis. Physics concerns what we cansay about nature." Bohr felt that every step in the development of physics has strengthened the view that the problem of establishing an unambiguous description of nature has only one solution. He regarded all attempts to replace our elementary concepts or to introduce a new logic to account for the peculiarities of quantum phenomena as not merely unnecessary but also incompatible with our most fundamental conditions, since we are suspended in a unique language.
    • Aage Petersen,"The philosophy of Niels Bohr" by in theBulletin of the Atomic Scientists Vol. 19, No. 7 (September 1963);The Genius of Science: A Portrait Gallery (2000) by Abraham Pais, p. 24, andNiels Bohr: Reflections on Subject and Object (2001) by Paul. McEvoy, p. 291
    • Quotes about quote:
      • To my great pleasure, Victor Weisskopf was sitting in his usual place in the front row, smiling approvingly up at me. (It's surprising how much such encouragement from such a source can improve the quality of a talk.) His smiles continued right up to the moment when I read the Petersen quotation. No sooner had I finished reading it than Viki was on his feet."That's outrageous," he proclaimed."Bohr couldn't possibly have said anything like that!" Somewhat taken aback by this sudden flip from approbation to condemnation, I feebly protested that I wasn't attributing it to Bohr, merely to Aage Petersen's memory of Bohr. That did not extinguish the flames."Shame on Aage Petersen," declared Viki,"for putting those ridiculous words into Bohr's mouth!"
  • [Bohr was] a marvelous physicist, one of the greatest of all time, but he was a miserable philosopher, and one couldn't talk to him. He was talking all the time, allowing practically only one or two words to you and then at once cutting in.
  • A big, athletic man, a terrible writer and famous mumbler, Bohr was, after Einstein, the greatest physicist of the era, remarkable not only for his intuitive brilliance but for a kindness that extended equally to his friends and to humanity.
    • Rebecca SolnitAs Eve Said to the Serpent: On Landscape, Gender, and Art (2001)
  • Niels Bohr distinguished two kinds of truths. An ordinary truth is a statement whose opposite is a falsehood. A profound truth is a statement whose opposite is also a profound truth.

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