It is not necessary, surely, to pause for proof that there is such a retrograde principle in the being of every man. It is demonstrated by facts, and by the analogy of all Nature. Three possibilities of life, according to Science, are open to all living organisms--Balance, Evolution, and Degeneration. The first denotes the precarious persistence of a life along what looks like a level path, a character which seems to hold its own alike against the attacks of evil and the appeals of good. It implies a set of circumstances so balanced by choice or fortune that they neither influence for better nor for worse. But except in theory this state of equilibrium, normal in the inorganic kingdom, is really foreign to the world of life; and what seems inertia may be a true Evolution unnoticed from its slowness, or likelier still a movement of Degeneration subtly obliterating as it falls the very traces of its former height. From this state of apparent Balance, Evolution is the escape in the upward direction, Degeneration in the lower. But Degeneration, rather than Balance or Elaboration, is the possibility of life embraced by the majority of mankind. And the choice is determined by man's own nature. The life of Balance is difficult. It lies on the verge of continual temptation, its perpetual adjustments become fatiguing, its measured virtue is monotonous and uninspiring. More difficult still, apparently, is the life of ever upward growth. Most men attempt it for a time, but growth is slow; and despair overtakes them while the goal is far away. Yet none of these reasons fully explains the fact that the alternative which remains is adopted by the majority of men. That Degeneration is easy only half accounts for it. Why is it easy? Why but that already in each man's very nature this principle is supreme? He feels within his soul a silent drifting motion impelling him downward with irresistible force. Instead of aspiring to Conversion to a higher Type he submits by a law of his nature to Reversion to a lower. This is Degeneration--that principle by which the organism, failing to develop itself, failing even to keep what it has got, deteriorates, and becomes more and more adapted to a degraded form of life.
All men who know themselves are conscious that this tendency, deep-rooted and active, exists within their nature. Theologically it is described as a gravitation, a bias toward evil. The Bible view is that man is conceived in sin and shapen in iniquity. And experience tells him that he will shape himself into further sin and ever deepening iniquity without the smallest effort, without in the least intending it, and in the most natural way in the world if he simply let his life run. It is on this principle that, completing the conception, the wicked are said further in the Bible to be lost. They are not really lost as yet, but they are on the sure way to it. The bias of their lives is in full action. There is no drag on anywhere. The natural tendencies are having it all their own way; and although the victims may be quite unconscious that all this is going on, it is patent to every one who considers even the natural bearings of the case that "the end of these things is Death." When we see a man fall from the top of a five-story house, we say the man is lost. We say that before he has fallen a foot; for the same principle that made him fall the one foot will undoubtedly make him complete the descent by falling another eighty or ninety feet. So that he is a dead man, or a lost man from the very first. The gravitation of sin in a human soul acts precisely in the same way. Gradually, with gathering momentum it sinks a man further and further from God and righteousness, and lands him, by the sheer action of a natural law, in the hell of a neglected life.
But the lesson is not less clear from analogy. Apart even from the law of Degeneration, apart from Reversion to Type, there is in every living organism a law of Death. We are wont to imagine that Nature is full of Life. In reality it is full of Death. One cannot say it is natural for a plant to live. Examine its nature fully, and you have to admit that its natural tendency is to die. It is kept from dying by a mere temporary endowment which gives it an ephemeral dominion over the elements--gives it power to utilize for a brief span the rain, the sunshine, and the air. Withdraw this temporary endowment for a moment and its true nature is revealed. Instead of overcoming Nature it is overcome. The very things which appeared to minister to its growth and beauty now turn against it and make it decay and die. The sun which warmed it, withers it; the air and rain which nourished it, rot it. It is the very forces which we associate with life which, when their true nature appears, are discovered to be really the ministers of death.