The evil things we have seen and still see all around us in contemporary humanity have come to the surface only to be carried off again. The decadence of human society and the degeneration of the human race which shadow contemporary history, are signs of the scum arising out of the human subconscious. But they arise only to be cleared away. Out of this clearance there will later come an awakening to the Good, an appreciation of the True. In this sense their darkness is an inverted precursor of the light, the worse which makes a way for the better. It is a token that the cycle of materialism will eventually turn on itself and yield to a cycle of spirituality.
-- Notebooks Category 11: The Negatives > Chapter 3: Their Presence in The World > # 6