As a man who has devoted his whole life to the most clearheaded science, to the study of matter, I can tell you as a result of my research about the atoms this much: There is no matter as such! All matter originates and exists only by virtue of a force which brings the particles of an atom to vibration and holds this most minute solar system of the atom together. . . . We must assume behind this force the existence of a conscious and intelligent Mind. This Mind is the matrix of all matter.
- —Das Wesen der Materie (The Nature of Matter), a 1944 speech in Florence, Italy. Source: Archiv zur Geschichte der Max‑Planck‑Gesellschaft, Abt. Va, Rep. 11 Planck, Nr. 1797