"A man's inner and spiritual life in its present earthly stream is subordinated to this very same general law, according to which every force is manifest or every work perfected thanks only to already existing forces or work. It has been thus constructed by God himself, and dualists speak in vain against this. One law! I know with complete and absolute reliability that if I begin to get angry, to be dissatisfied, and to curse regarding the train stopping, then my spiritual energy would be wasted aimlessly in the external environment, and I would in no way be able to enjoy myself now with the spring morning in the woods and to reflect calmly on physical and moral truths. But I also know that if the capacity of anger and a passionate temper were not in me, if I was bereft of this dark fire, then I would also have nothing to pay for the clarity of soul and for the quaff of immortality that pours into me this bright, Divine day. If there were no evil passion in me at all as a latent force, as potential energy, then I would be as dispassionate as a corpse, which rots as easily as a log; it does not take anything to destroy it like a pile of sand that the first breeze will disperse.
-V.S. Soloviev, Politics, Law, Morality