Two things are commonly intended by the word sanctification. The first is, the mortification of sin, the last, the increase of the vigour and constancy of the exercises of piety. But, although these may be distinguished, yet there is no need to treat of them separately, because the advancement of the one cannot but be accompanied with progress in the other. Like the two scales of a balance, when one is depressed the other rises. Just so in the divine life in the soul, if pride is humbled, humility is of necessity increased; if the undue love of the creature is mortified, the love of God will be strengthened; and so of every other grace. Indeed, when we examine the subject accurately, we shall find, that all real mortification of sin is by the exercise of faith, and those holy affections which flow from it. By legal striving, however earnest, or by ascetic discipline, however rigid, very little headway is made against the stream of inherent corruption.
Archibald Alexander, A Brief Compend of Bible Truth, 134.