" St. Thomas himself recalls the saying of Aristotle that “the thing is the whiter, the less it is mixed with black,”45 without mentioning, however, that the reverse proposition: “the thing is the blacker, the less it is mixed with white,” not only has the same validity as the first but is also its logical equivalent. He might also have mentioned that not only darkness is known through light, but that, conversely, light is known through darkness. "

― C.G. Jung , Aion (Collected Works 9ii)