“I also knew the formula that expresses the energy distribution in the normal spectrum. A theoretical interpretation therefore had to be found at any cost, no matter how high. It was clear to me that classical physics could offer no solution to this problem, and would have meant that all energy would eventually transfer from matter to radiation. ...This approach was opened to me by maintaining the two laws of thermodynamics. The two laws, it seems to me, must be upheld under all circumstances. For the rest, I was ready to sacrifice every one of my previous convictions about physical laws. ...[One] finds that the continuous loss of energy into radiation can be prevented by assuming that energy is forced at the outset to remain together in certain quanta. This was purely a formal assumption and I really did not give it much thought except that no matter what the cost, I must bring about a positive result.”

— Max Planck

Letter to Robert W. Wood (October 7, 1931) in Archive for the History of Quantum Physics, Microfilm 66, 5, as cited in Thomas S. Kuhn, Black-Body Theory and the Quantum Discontinuity, 1894–1912 (1978) pp. 132, 288. Translation of the entire letter, which is follow above is in Armin Hermann, Frühgeschiche der Quantentheorie (1899–1913) Mosbach/Baden: Physik Verlag (1969), transl. Claude W. Nash, p. 23 of the translation; and also in M. S. Longair,Theoretical Concepts in Physics(Cambridge and NewYork: Cambridge University Press, 1984), ch. 6–12, p. 222. All as quoted/cited by Clayton A. Gearhart, "Planck, the Quantum, and the Historians" http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.613.4262&rep=rep1&type=pdf, Physics in Perspective, 4 (2002) 170-215.

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Max Planck 30

German theoretical physicist 1858–1947

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