1
On the other side, Church spokesmen could scarcely become enthusiastic about Planck's deism, which omitted all reference to established religions and had no more doctrinal content than Einstein's Judaism.J.L. Heilbron
2
For modern cosmology God cannot be a working hypothesis because God is not given to us in the observable nature of things. The poetic and theological idea that the universe is an expression of God's creative power is false. And yet the possibility that underlying the nature of things is an undiscoverable force of unimaginable simplicity that one may call God haunts and frustrates modern science. If this principle exists, then it cannot be different from our experience of it: it must be inherent, not transcendent; purely natural, therefore, not a violation of its own being, and hence intelligent, in the sense it requires coherence rather than chaos and confusion to exist at all--as the ancient myths tell us; impersonal to the extent that we cannot attribute moral purposes or even will, classically understood, to what we can observe of its operations. It is entirely coextensive and if it has a limit coterminous with what is--a perception that dates in theology from Anselm to Tillich and in natural philosophy from Democritus to Planck. It does not exist in gaps of undiscovered data or models or as an unsolved mystery but in the givenness of the world and the intelligent life form that has arisen to ponder it.R. Joseph Hoffmann
3
After the discovery of spectral analysis no one trained in physics could doubt the problem of the atom would be solved when physicists had learned to understand the language of spectra. So manifold was the enormous amount of material that has been accumulated in sixty years of spectroscopic research that it seemed at first beyond the possibility of disentanglement. An almost greater enlightenment has resulted from the seven years of Röntgen spectroscopy, inasmuch as it has attacked the problem of the atom at its very root, and illuminates the interior. What we are nowadays hearing of the language of spectra is a true 'music of the spheres' in order and harmony that becomes ever more perfect in spite of the manifold variety. The theory of spectral lines will bear the name of Bohr for all time. But yet another name will be permanently associated with it, that of Planck. All integral laws of spectral lines and of atomic theory spring originally from the quantum theory. It is the mysterious organon on which Nature plays her music of the spectra, and according to the rhythm of which she regulates the structure of the atoms and nuclei.Arnold Sommerfeld