Max Planck (1858–1947) is regarded as the founder of quantum physics. His quantum of action h, formulated on 14 December 1900, is the fundamental constant of modern physics; in 1918 he received the Nobel Prize for it. In the German schoolbook Planck is present with the radiation law, the quantum hypothesis and the transition from continuous to quantised energy exchange. What is practically absent from the schoolbook is the second side of his work: a Nobel laureate who, in an extensive interview in The Observer on 25 January 1931, said "I regard consciousness as fundamental. I regard matter as derivative from consciousness", who in 1937 delivered a lecture Religion und Naturwissenschaft in the Baltic region whose printed version went through several editions, and who served as a practising Lutheran for decades as a Kirchenältester (church elder) of the Berlin-Grunewald congregation. This half of the biography is well documented, frequently cited and discussed beyond academic physics history – in the school canon of the natural sciences it is systematically absent.
Who was Planck?
Max Karl Ernst Ludwig Planck was born on 23 April 1858 in Kiel into a family of Protestant lawyers and theologians. His father Wilhelm Planck was a professor of jurisprudence; his grandfather, a mediating theologian at the University of Göttingen. This double tradition – rule-of-law rigour and Protestant theology – shaped Planck throughout his life. He studied from 1874 in Munich and from 1877 in Berlin, attended lectures by Helmholtz and Kirchhoff, and obtained his doctorate in Munich in 1879 with a dissertation on the second law of thermodynamics. In 1889 he succeeded Kirchhoff in the chair of theoretical physics in Berlin, which he held until 1928.
Between October and December 1900 Planck arrived at his radiation formula by postulating that the energy emission of black bodies can occur only in discrete portions hν. The constant h – today "Planck's constant" – is one of the few truly fundamental constants of physics. What Planck initially understood as a formal trick became, through Einstein (photoelectric effect 1905) and Bohr (atomic model 1913), the foundation of modern quantum physics. Planck received the Nobel Prize in 1918, the year after the publication of his famous autobiographical lecture The Origin and Development of the Quantum Theory.
Profile at a glance: Max Planck
| Dates | 23 April 1858 (Kiel) to 4 October 1947 (Göttingen) |
|---|---|
| In the schoolbook | Quantum hypothesis 1900, Planck's radiation formula, the constant h, Nobel Prize 1918 |
| Not in the schoolbook | The Observer 1931 ("consciousness as fundamental"), Religion und Naturwissenschaft 1937, church elder Berlin-Grunewald |
| Academic offices | Berlin chair 1889–1928, Secretary of the Prussian Academy 1912–1938, President of the Kaiser-Wilhelm-Gesellschaft 1930–1937 |
| Confession | Lutheran; active congregational elder over decades |
What is in the schoolbook: the 1900 quantum of action
Planck's radiation formula solved the then-pressing problem of the spectral energy distribution of the black body. The previously valid formulas (Rayleigh-Jeans in the long-wavelength range, Wien in the short-wavelength range) contradicted each other in the middle range. Planck wrestled for months with the mathematical construction and at the session of the German Physical Society on 14 December 1900 arrived at the formula that could be justified only by assuming a quantised emission of energy. The quantum of action h has the value 6.626 · 10⁻³⁴ J·s and is today one of the defining constants of the international system of units (SI revision 2019).
The academic sequel is textbook material: Einstein in 1905 explains the photoelectric effect using light quanta and receives the Nobel Prize for this in 1921; Bohr in 1913 models the hydrogen atom with quantised orbits; Heisenberg, Schrödinger and Dirac develop full quantum mechanics in the 1920s. Planck himself remained sceptical of the probabilistic Copenhagen interpretation – he wished for a causally realistic interpretation and stood closer in this to Einstein than to Bohr. In German schoolbooks this line – quantum hypothesis, atomic models, wave mechanics – is reliably present.
What is not in the schoolbook: consciousness as fundamental
On 25 January 1931 the London Observer published an interview with Max Planck conducted by the science journalist and physics interpreter J. W. N. Sullivan. Sullivan had been running for several years a series of interviews with leading natural scientists in which he addressed not their research results but the philosophical attitude behind them. Asked whether consciousness can be explained in terms of matter and its laws, Planck answered:
"No. I regard consciousness as fundamental. I regard matter as derivative from consciousness. We cannot get behind consciousness. Everything that we talk about, everything that we regard as existing, postulates consciousness."
The interview is primary-source documented in the Observer archive of 25 January 1931 and is referenced in the Wikiquote database as well as in numerous secondary works in the history of science. It is not a slip, not an apocryphal later attribution and not an out-of-context citation: it is the deliberate answer of a then 73-year-old Nobel laureate to a fundamental question put to him. The statement "consciousness is fundamental, matter is derivative" is – in the rigour with which Planck delivers it here – an explicitly idealist ontology from the mouth of the founder of modern quantum physics.
Religion and natural science, Baltic, May 1937
In May 1937 Planck delivers in the Baltic region (in Dorpat, today's Tartu in Estonia, as well as in Riga) the lecture Religion und Naturwissenschaft. The printed version appears in 1938 at Johann Ambrosius Barth in Leipzig and in subsequent years in several editions; it is catalogued in the Deutsche Digitale Bibliothek. The lecture is Planck's most extensive systematic engagement with the relationship between religion and natural science. The central thought:
"Both religion and natural science require a belief in God for their activity; for the former He stands at the beginning, for the latter at the end of all thought. For the former He is the foundation, for the latter the crown of the edifice of the world."
Planck does not argue apologetically and not reductively. His point is analytic: religion and natural science work on different ends of the same question of reality, and each runs up against the side from which the other proceeds. Natural science begins with experienceable reality and arrives – on Planck's reading – at the end of its rigour at an order that can no longer be an object of natural science. Religion begins at this order and works from there into the world. Both need what the other is, without being able to replace each other.
That this lecture takes place in 1937 – the year in which Planck, then 79, was forced to lay down his presidency of the Kaiser-Wilhelm-Gesellschaft because he had refused to dismiss Jewish staff without resistance – is not incidental. Planck speaks here with the authority of someone who is holding his position even under political pressure.
Personal tragedies and faith
Planck's religious position is not academic theory but a stance shaped by his life. Over the years he lost practically all his children before himself: his first wife Marie dies in 1909 of tuberculosis; son Karl falls at Verdun in 1916; daughter Grete dies in 1917 in childbed shortly after the birth of her first child; daughter Emma dies in 1919 also in childbed, days after her first child – an almost incomprehensible repetition. In 1945, at the age of 87, his son Erwin Planck is condemned to death by the People's Court for involvement in the Stauffenberg circle and is executed on 23 January 1945 in Berlin-Plötzensee. Planck outlives his last son by two years and dies on 4 October 1947 in Göttingen.
In his letters and in the posthumously published Wissenschaftliche Selbstbiographie, Planck describes faith as what carried him through this sequence of losses. He was for decades an active congregational elder of the Evangelical congregation in Berlin-Grunewald and held this function explicitly not as a private matter but as a public statement – a sitting chair-holder and later president of the Kaiser-Wilhelm-Gesellschaft who was at the same time a church elder in the capital congregation.
The problematic Florence quotation of 1944
A brief note on a quotation very popular in spiritual circles that is attributed to Planck in an alleged lecture The Nature of Matter in Florence in 1944 – with the famous line that behind matter one must "assume a conscious, intelligent spirit". The [Max Planck Archive of the MPG itself has publicly flagged this quotation as doubtful](https://www.archiv-berlin.mpg.de/201046/Max-Planck-und-ein-zweifelhaftes-Zitat): there is only an undated, unsigned typescript without a clean provenance, and a real chain of sources is missing. In substance the quotation matches Planck's documented thought; in source criticism it is not robust. We therefore do not use it in this article as evidence – the Observer answer of 1931 and the Religion und Naturwissenschaft lecture of 1937 say the essential things, and they are source-critically clean.
Pattern connection
Planck belongs structurally to the post-1906 generation of the pattern that we described in our series The 1906 Pattern. Unlike Schrödinger or Heisenberg, however, he is at the beginning of this window already an established top natural scientist (born 1858) – meaning that he makes the transition to the post-1906 constellation as an already-made man, with the sovereignty of a life-tenured chair-holder who no longer needs to make a career. Precisely this position allowed him in 1931 the Observer answer and in 1937 the Baltic lecture.
His case illustrates the pattern from an interesting angle: it is not the case that after 1906 no top natural scientist any longer speaks about consciousness and religion. Planck does, Heisenberg does, Schrödinger does. What shifts is the institutional fate of these statements. Planck's quantum hypothesis enters the curriculum. His Observer answer does not. His Religion und Naturwissenschaft lecture, which appeared in four editions during his lifetime, is today cited in no German schoolbook. The filtering does not operate on the statement itself (the statement is made), but on its transmission. That is exactly the pattern that we described in our article on Prussian compulsory schooling as curriculum filtering.
What remains
- Founder of quantum physics. Planck is not one Nobel laureate among many – he is the source of the entire quantum-theoretical line that begins in 1900 with his radiation formula.
- Consciousness as fundamental. His Observer answer of 1931 is one of the clearest statements by a top natural scientist for a consciousness-fundamental ontology that exists at all. It is source-critically clean and well documented.
- Religion und Naturwissenschaft 1937. The Baltic lecture develops the relationship of faith and science systematically and was published in multiple editions – a primary text, not hearsay.
- A stance shaped by life. The series of personal losses (four children, a wife, an executed son) makes Planck's religious position a biographically borne stance, not an academic theory.
- Filtering not of the statement but of its transmission. The second half of Planck is preserved in the academic work and in the letter culture. It does not disappear through censorship but through the institutional path dependency by which later curricula transmit only the quantum-theoretical half.
Sources
- Max Planck, interview by J. W. N. Sullivan in The Observer, 25 January 1931, "I regard consciousness as fundamental…" – see Wikiquote: Max Planck.
- Max Planck, Religion und Naturwissenschaft. Vortrag gehalten im Baltikum (Mai 1937), Johann Ambrosius Barth, Leipzig 1938 (several editions). Entry in the Deutsche Digitale Bibliothek.
- Max Planck, Wissenschaftliche Selbstbiographie, J. A. Barth, Leipzig 1948 (posthumous).
- Max Planck, Sinn und Grenzen der exakten Wissenschaft, lecture 1941, repeatedly printed.
- Max Planck Archive of the MPG: "Max Planck and a Doubtful Quotation" – on the provenance problem of the 1944 Florence "The Nature of Matter" quotation.
- Astrid Wagner, Max Planck – Glaube und Wissenschaft, Evangelical College Berlin, edited volume 2018.
- Heaven Connect: The 1906 Pattern and Prussian Compulsory Schooling and the Path Dependency of a Curriculum.