I speak after the manner of men because of the weakness of your flesh: for as you have yielded your members servants to uncleanness and to iniquity unto iniquity; even so now yield your members servants to righteousness unto holiness.
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Ambrosiaster
AD 400
In recalling the weakness of the flesh, Paul wants to say that he is demanding less from us than the worship of God would normally require…. In order to remove from us any reason to be afraid of coming to faith, because that might seem to us to be unbearable and rough, Paul commands us to serve God with the same amount of zeal that we previously served the devil. For as we ought to be more willing to serve God than the devil, given that God brings salvation and the devil damnation, yet the spiritual physician does not demand more from us, lest in avoiding the more difficult precepts on account of our weakness we should remain in death. Thus the Lord says: “Take my yoke upon you, for my yoke is easy and my burden is light.” Commentary on Paul’s Epistles.
I speak a human thing, or I am proposing to you what is according to human strength and ability assisted by the grace of God, with a due regard to the weakness and infirmity of your flesh. The sense, according to St. Chrysostom is this, that the apostle having told them they must be dead to sin, lead a new life he now encourages them to it, by telling them, that what is required of them is not above their human strength, as it is assisted by those graces which God offers them, and which they have received. Where we may observe that these words, I speak a human thing, are not the same, nor to be taken in the same sense, as chap. iii. 6. when he said, I speak after a human way, or I speak like men. (Witham)
What I ask of you, Christian Romans, is, that you so earnestly labour for your sanctification as to improve daily in virtue, as formerly you plunged every day deeper and deeper into vice. (Menochius)
Paul says that he is speaking in human terms in order to show that he is not making any exorbitant demand, nor even as much as might be expected from someone who enjoyed so great a gift, but rather a moderate and light request…. The two masters are very different from each other, but even so, Paul is asking for no more than the same amount of servitude. People really ought to give much more to the service of righteousness, since righteousness is obviously so much bigger and better. But because of their weakness, which he does not ascribe to their free will or to their spirit but to their flesh, Paul is not making any greater demands on them.
After showing with a reason based on God’s grace that we should not continue in sin but should serve God, the Apostle shows the same thing with a reason based on a condition of the former life. In regard to this he does three things: first, he describes the terms in which he will present his teaching; secondly, he presents the teaching [v. 19b; n. 506]; thirdly, be gives the reason for the teaching [v. 20; n. 507]. 505. First, therefore, he says: I have advised that you yield yourselves to God. I am now speaking to you in human terms, i.e., as suited to human feebleness. For man is sometimes so presented in Scripture to signify a weakness of the human condition: "I am a weak man, and of a short time, and falling short of the understanding of judgment and laws" (Wis 9:5); "Since there are jealousy and strife among you, are you not carnal and walking as mere men?" (1 Cor 3:3). He assigns the cause, when he adds, because of the limitations; for it is to the mature that the more perfect pr...