The cessation of sinful inclination must be caused by the origination of holy inclination. Sin does not first stop, and then holiness come into the place of sin; but holiness positively expels sin. Darkness does not first cease, and then light enter; but light drives out darkness. Sin goes out, as Chalmers phrases it, by “the expulsion power of a new affection.”

—William G. T. Shedd
Dogmatic Theology, 769.