There can be no doubt, therefore, that justification and sanctification differ from each other. At the same time, it seems to be equally true that in some respects they are closely allied, and sustain a near resemblance. And in particular, they both come into existence, and are both sustained, in connection with the same mighty principle, viz.: by faith. The doctrine of justification by faith may be regarded as a doctrine generally conceded and settled. And when the subject has been fully examined, we cannot well doubt, that the doctrine of sanctification in the same manner, viz. by faith, will be conceded and established with equal weight of evidence, and with equal unanimity of opinion. We begin to live by faith; and we continue to live in the same methods, which made the beginning. We received forgiveness in the first instance by faith; and in the reception of any and every spiritual favor, which may be necessary in our further progress, and which may properly be included under the general grace of sanctification, we need the same faith.
Hermann Francke, “and washed me in his blood, so that my salvation is rendered sure, through grace. My beginning, progress, and ending, is by FAITH in Jesus Christ. When I feel my utter inability, and acknowledge that I can do nothing of myself, and cast myself upon his mercy alone, I feel a new power of communication to my soul. I do not seek to be justified in one way, and sanctified in another.” [Memoirs of Augustus Hermann Francke, Chap. 2d.]
— edited from The Life of Faith Part 1, Chapter 9.