Romans 6:19

I speak after the manner of men because of the infirmity of your flesh: q.d. I accommodate myself to your capacity, because of the weakness of your understanding in spiritual things; therefore I use this familiar similitude of service and freedom, that by these secular and civil things you might the better understand such as are spiritual: see 1 Thessalonians 3:12. For as ye have yielded, &c.: q.d. The great thing that I desire of you (and it is most reasonable) is this, that you would be as sedulous and careful now to obey God, as you have formerly been to obey and serve sin; to do good, as you have been to do evil. To uncleaness; to fleshly lusts, which defile you. To iniquity unto iniquity; i.e. adding one sin to another; or else by the former you may understand original, by the latter actual sin. He useth three words about the service of sin, and but two about the service of God; wicked men take great pains for hell; oh that we would take the same for heaven.