Romans 6:15-19

Verse 15

Shall we sin because we are not under the law - Shall we abuse our high and holy calling because we are not under that law which makes no provision for pardon, but are under that Gospel which has opened the fountain to wash away all sin and defilement? Shall we sin because grace abounds? Shall we do evil that good may come of it? This be far from us!
Verse 16

To whom ye yield yourselves - Can you suppose that you should continue to be the servants of Christ if ye give way to sin? Is he not the master who exacts the service, and to whom the service is performed? Sin is the service of Satan; righteousness the service of Christ. If ye sin ye are the servants of Satan, and not the servants of God.

The word δουλος, which we translate servant, properly signifies slave; and a slave among the Greeks and Romans was considered as his master's property, and he might dispose of him as he pleased. Under a bad master, the lot of the slave was most oppressive and dreadful; his ease and comfort were never consulted; he was treated worse than a beast; and, in many cases, his life hung on the mere caprice of the master. This state is the state of every poor, miserable sinner; he is the slave of Satan, and his own evil lusts and appetites are his most cruel task-masters. The same word is applied to the servants of Christ, the more forcibly to show that they are their Master's property; and that, as he is infinitely good and benevolent, therefore his service must be perfect freedom. Indeed, he exacts no obedience from them which he does not turn to their eternal advantage; for this master has no self-interest to secure. See on Rom 1:1 (note).
Verse 17

But God be thanked, that ye were the servants of sin - This verse should be read thus: But thanks be to God that, although ye were the servants of sin, nevertheless ye have obeyed from the heart that form of doctrine that was delivered unto you; or, that mould of teaching into which ye were cast. The apostle does not thank God that they were sinners; but that, although they were such, they had now received and obeyed the Gospel. The Hebrew phrase, Isa 12:1, is exactly the same as that of the apostle here: In that day thou shalt say, I will praise thee, for thou wast angry with me: that is, although thou wast angry with me, thou hast turned away thy wrath, etc.

That form of doctrine - Τυπον διδαχης; here Christianity is represented under the notion of a mould, or die, into which they were cast, and from which they took the impression of its excellence. The figure upon this die is the image of God, righteousness and true holiness, which was stamped on their souls in believing the Gospel and receiving the Holy Ghost. The words εις ὁν παρεδοθητε τυπον refer to the melting of metal; which, when it is liquefied, is cast into the mould, that it may receive the impression that is sunk or cut in the mould; and therefore the words may be literally translated, into which mould of doctrine ye have been cast. They were melted down under the preaching of the word, and then were capable of receiving the stamp of its purity.
Verse 18

Being then made free from sin - Ελευθερωθεντες is a term that refers to the manumission of a slave. They were redeemed from the slavery of sin, and became the servants of righteousness. Here is another prosopopoeia: both sin and righteousness are personified: sin can enjoin no good and profitable work; righteousness can require none that is unjust or injurious.
Verse 19

I speak after the manner of men - This phrase is often used by the Greek writers to signify what was easy to be comprehended; what was ad captum vulgi, level with common understandings, delivered in a popular style; what was different from the high flights of the poets, and the studied sublime obscurity of the philosophers.

Because of the infirmity of your flesh - As if he had said: I make use of metaphors and figures connected with well-known natural things; with your trades and situation in life; because of your inexperience in heavenly things, of which ye are only just beginning to know the nature and the names.

Servants to uncleanness, etc. - These different expressions show how deeply immersed in and enslaved by sin these Gentiles were before their conversion to Christianity. Several of the particulars are given in the first chapter of this epistle.
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