Another step is here taken by the Psalmist. He looks shrinkingly and shudderingly into a possible depth, and he sees, going down into the abyss, a ladder with three rungs on it. The topmost one is wilful, self-conscious transgression. But that is not the lowest stage; there is another step. Presumptuous sin tends to become despotic sin. 'Let them not _have dominion_ over me.' A man may do a very bad thing once, and get so wholesomely frightened, and so keenly conscious of the disastrous issues, that he will never go near it again. The prodigal would not be in a hurry, you may depend upon it, to try the swine trough and the far country, and the rags, and the fever, and the famine any more. David got a lesson that he never forgot in that matter of Bathsheba. The bitter fruit of his sin kept growing up all his life, and he had to eat it, and that kept him right. They tell us that broken bones are stronger at the point of fracture than they were before. And it is possible for a man's sin--if I might use a paradox which you will not misunderstand--to become the instrument of his salvation. But there is another possibility quite as probable, and very often recurring, and that is that the disease, like some other morbid states of the human frame, shall leave a tendency to recurrence. A pin-point hole in a dyke will be widened into a gap as big as a church-door in ten minutes, by the pressure of the flood behind it. And so every act which we do in contradiction of our standing as professing Christians, and in the face of the protests, all unavailing, of that conscience which is only a voice, and has no power to enforce its behests, will tend to recurrence once and again. The single acts become habits, with awful rapidity. Just as the separate gas jets from a multitude of minute apertures coalesce into a continuous ring of light, so deeds become habits, and get dominion over us. 'He sold himself to do evil.' He made himself a bond-slave of iniquity. It is an awful and a miserable thing to think that professing Christians do often come into that position of being, by their inflamed passions and enfeebled wills, servants of the evil that they do. Alas! how many of us, if we were honest with ourselves, would have to say. 'I am carnal, sold unto sin.' That is not the lowest rung of the slippery ladder. Despotic sin ends in utter departure.