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"Planck told us in 1900 - and the essential features are still true today - that he could comprehend the radiation of red-hot iron, or of an incandescent star such as the sun, only if this radiation is exclusively produced in portions and transferred in portions from one carrier to another (e.g. from atom to atom). This was startling, since this radiation concerns energy, originally an extremely abstract cocept.

Erwin Schrödinger, 1952
Audio-document from the lecture "Was ist Materie?"
English translation: taken from the article
"Our Conception of Matter"
(in What is Life? and Other Scientific Essays)