Sanctification is a great benefit. Whoever the Lord bestows it upon, He puts an honor on, for they are set apart for Himself. There is an intrinsic glory in holiness– Ps. 45:13: “The King’s daughter is all glorious within.” God is glorious in it and therefore no wonder it be the glory of the creature. When the Lord makes one holy, He does more for him than if He gave him all the gold of the Indies or made him the sole monarch of the world. The gift of sanctification is of more worth than the Spirit of prophecy or the faith of miracles. Men may be ruined with those gifts, but not with this one.
– Thomas Boston