If it be so, that sin doth thus always abide in us, and will upon occasions work to all its fruit, to all manner of concupiscence, then the mortification of sin is a continual duty, that we ought to be exercised in all our days. Col. 3:3, "Ye are dead, and your life is hid with Christ in God." A blessed state and condition! I desire no better attainment in this world than this holds out. But what duty does the apostle infer from thence? "Therefore," saith he, "mortify your members which are upon the earth." What, I pray? "Fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry." The mortification of sin is a duty incumbent upon the best of saints.