The energy principle had held for all the terms, and I could no longer doubt the mathematical consistency and coherence of the kind of quantum mechanics to which my calculations pointed. At first, I was deeply alarmed. I had the feeling that, through the surface of atomic phenomena, I was looking at a strangely beautiful interior, and felt almost giddy at the thought that I know had to probe this wealth of mathematical structure nature had so generously spread out before me.
~ Werner Heisenberg; writing about the connection between discovering the nature of quantum reality and its beauty
