Pauli was – with Bohr, Planck, Heinsenberg, Dirac et al – a pioneer of quantum mechanics and Nobel Prize winner for Physics for discovery of the exclusion principle. He could equally have won the prize for his discovery of the Neutrino or of PCT Symmetry.
He is less known for his work on the philosophy of knowledge and for his work with Carl Jung on the links between physics and the psyche. They wrote papers together (in some of which Einstein participated) , which were only discovered and published in the 1970’s and also co-authored the book “The Interpretation of Nature and the Psyche”.
In 1955 he gave a lecture at the University of Hamburg, “Science and Western Thought”, which he later described in analysis to Jung and to Niels Bohr. His interest throughout his life was to reconcile the “rational-critical” (Western Science) with the “mystical-irrational” (Eastern thought), to try to create a single framework of the physical and psychical.
“it is precisely by these means, that the scientist can more or less consciously tread a path of inner salvation. Slowly then develop inner images, fantasies or ideas, compensatory to the external situation”.
His belief in complementarity was fundamental; not just in physics but in general. For him and Jung the conscious and unconscious are mirrors of each other, and an understanding built solely out of one or the other is necessarily incomplete. (What Pauli sometimes referred to – witheringly – as “not even wrong”). This extended to his views on wider existence. He had an abiding interest in the views of Kepler and Newton – scientists working out of the alchemy tradition – “as above, so below” whose physical discoveries were incidental (to them) in their pursuit of the truth of God.
Pauli, with many great creative scientists, was a polymath. His scientific credentials are impeccable. His god-father was Ernst Mach and he was mentored by Arnold Sommerfeld. Albert Einstein proposed him for his Nobel Prize. He was a lifelong friend and collaborator of Bohr, Heisenberg and Dirac. All of his inquiring brought him to a concrete sense of the motive force and nature that lies beyond the physical or material world. He had a strong sense of humanity and humour, dealing gently with those of other or non-belief. For instance in response to Paul Dirac (who famously could not tolerate the religions and their politics) he quipped – “Well, I’d say that also our friend Dirac has got a religion and the first commandment of this religion is ‘God does not exist and Paul Dirac is his prophet'”.
Here he is on the nature of knowledge itself:
“the natural laws are of such a kind that every bit of knowledge gained from a measurement must be paid for by the loss of other, complementary items of knowledge.. the process of knowing is connected with the religious experience of transmutation undergone by him who acquires knowledge. This connection can only be comprehended through symbols which both imaginatively express the emotional aspect of the experience and stand in vital relationship to the sum total of contemporary knowledge and the actual process of cognition. Just because in our times the possibility of such symbolism has become an alien idea, it may be considered especially interesting to examine another age to which the concepts of what is now called classical scientific mechanics were foreign but which permits us to prove the existence of a symbol that had, simultaneously, a religious and a scientific function.”
Walter Heisenberg wrote of Pauli’s beliefs (in his book – “Across the Frontiers”)
“Pauli.. points out that even Kepler’s conversion to the Copernican theory, which marks the beginning of modern natural science, was decisively affected by certain primeval images or archetypes. He cites this passage from Kepler’s Mysterium Cosmographicum: “The image of the triune God is in the sphere, namely of the Father in the centre, of the Son in the outer surface and of the Holy Ghost in the uniformity of connection between point and intervening space or surroundings”.
“Pauli considers, moreover, that Kepler’s symbol illustrates quite generally the attitude from which contemporary science has arisen. “From an inner centre, the mind seems to move outward in a sort of extraversion into the physical world, in which all happenings are assumed to be automatic, so that the spirit serenely encompasses this physical world , as it were, with its Ideas.” Thus the natural science of the modern era involves a Christian elaboration of the “lucid mysticism” of Plato, in which the unitary ground of spirit and matter is sought in the primeval images, and in which understanding has found its place in its various degrees and kinds, even to knowledge of the word of God.”