“I’m simply not thinking philosophically right now when I’m approaching things scientifically. “Spiritualism,” as expressed in words, is for me a clear unreality. I suspect that, wordlessly and unconsciously, I delve deeper into scientific work than any philosopher or religious mystic— thinking in words—can ever reach. It’s as if a musician—Bach, Beethoven, Mozart, or someone else—penetrated “to the very end” without words.” Letter to B.L. Lichkov, November 1, 1940.