I speak after the manner of men because of the infirmity of your flesh: for as ye have yielded your members servants to uncleanness and to iniquity unto iniquity; even so now yield your members servants to righteousness unto holiness.
19. I speak what is human, etc. He says that he speaks after the manner of men, not as to the substance but as to the manner. So Christ says, in John 3:12, that he announced earthly things, while yet he spoke of heavenly mysteries, though not so magnificently as the dignity of the things required, because he accommodated himself to the capacities of a people ignorant and simple.
To use the doctrine of grace as license for sin is to abuse it utterly and reject it with abhorrence. Any opinion that opens a door to practical immorality, however plausible its appeal to free grace, contradicts the truth as it is in Jesus. Sanctification consists in two things: mortification, dying to sin, and vivification, living to righteousness.
AI summary
Commenting on Romans 6:1-23
I speak after the manner of men,.... This refers either to what the apostle had said already concerning service and liberty, things which were known among men, and easy to be understood; or to the following exhortation: what he was about to say, he delivered in a manner suited to their understandings, and was "that which was human"; not angelic, or what required the power...