6:16-20 Every man is the servant of the master to whose commands he yields himself; whether it be the sinful dispositions of his heart, in actions which lead to death, or the new and spiritual obedience implanted by regeneration. The apostle rejoiced now they obeyed from the heart the gospel, into which they were delivered as into a mould. As the same metal becomes a new vessel, when melted and recast in another mould, so the believer has become a new creature. And there is great difference in the liberty of mind and spirit, so opposite to the state of slavery, which the true Christian has in the service of his rightful Lord, whom he is enabled to consider as his Father, and himself as his son and heir, by the adoption of grace. The dominion of sin consists in being willingly slaves thereto, not in being harassed by it as a hated power, struggling for victory. Those who now are the servants of God, once were the slaves of sin.
16. that to whom ye yield yourselves servants to obey—with the view of obeying him.
his servants ye are to whom ye obey—to whom ye yield that obedience.
whether of Sin unto death—that is, "issuing in death," in the awful sense of Ro 8:6, as the sinner's final condition.
or of Obedience unto righteousness—that is, obedience resulting in a righteous character, as the enduring condition of the servant of new Obedience (1Jo 2:17; Joh 8:34; 2Pe 2:19; Mt 6:24).