Sanctification: What It Isn’t
Sanctification is not a progressive improvement of the Adamic nature, but a growing maturity of sound judgment. From Sanctification: What Is It? by C.H. Mackintosh:
…This leads us to the second objection, to the erroneous theory of the progressive sanctification of our nature, namely, the objection drawn from the truthful experience of all believers. Is the reader a true believer? If so, has he found any improvement in his old nature? Is it a single whit better now than it was when he first started on his Christian course? He may, and should through grace, be able to subdue it more thoroughly; but it is nothing better. If it be not mortified, it is just as ready to spring up and show itself in all its vileness as ever. “The flesh” in a believer is in no wise better than “the flesh” in an unbeliever. And if the Christian does not bear in mind that self must be judged, he will soon learn by bitter experience that his old nature is as bad as ever; and, moreover, that it will be the very same to the end.