Scripture says that we (Christians) are no longer under law. Can you explain to me why you teach that Christians are obliged to walk by God’s Law-Word?
Let’s look at the passage that you reference
Romans 6:12 Therefore do not let sin reign in your mortal body so that you obey its lusts, 13 and do not go on presenting the members of your body to sin as instruments of unrighteousness; but present yourselves to God as those alive from the dead, and your members as instruments of righteousness to God. 14 For sin shall not be master over you, for you are not under law but under grace.
Paul is using the word “law” here to designate that which must be fulfilled as a required precursor to acceptance with God. The Christian has been delivered from being under law as a means of find peace with God. As such, when St. Paul says here that we are not “under law” he is not suggesting that God’s law is no longer relevant to the Christian. Paul is saying that the Christian is not under law as a systematic program to escape condemnation.
If Christians did yet remain under the law as a totalistic program for righteousness then sin would continue to have dominion over the Christian since the law, as a program for righteousness, cannot deliver but can only accuse. Because the Christian is under the reign of grace as God’s means of righteousness the Christian can refuse to let sin reign in their mortal bodies. “Under the reign of Grace” provides a power source for dealing with sin that “Under the reign of Law” could never provide, dead as we were in Adam.
Note also, though that at the Apostle repeatedly talks about “sin.” This implies a necessity for the concept of law because there is no way to even know what sin is apart from a standard (God’s Law) by which sin can be defined and identified. If we were to be done with the law, as many Christians advocate, then we would also be done with any concept of sin. It does me no good to encourage me to say no to sin or to lust if at the same time there is no law that standardizes what sin is. How could we possibly know what behavior, thinking, attitudes please our great Liege-Lord apart from His Law-Word?
Christ did not redeem us so that we might walk contrary to His Law-Word. The Law’s intent is not so that by the keeping of it we can be saved. We can’t keep it as it is needed to be kept. That is why Christ came as our covenant head. Our Lord Christ fulfilled the law in our stead and because of the righteousness accounted to us we are counted Law keepers. Similarly, our covenant head, the Lord Christ, bore our penalty in our place on the Cross that our indebtedness to the Law is fulfilled as we are united to Christ.
BUT now that the law has been fulfilled for us in Christ’s law keeping and penalty bearing we now walk in terms of God’s law. We delight in God’s law now, not as means of gaining something we do not have. We delight in God’s law now, as a consequence of being given something, via imputation of Christ’s righteousness, that we could not earn or merit.
As WCF IX:18 notes, “Law and grace do doth sweetly comply (agree).” We can not posit Grace against law for the Christian. God’s law for the Christian is gracious and God’s grace unto the Christian was due to its honoring all that the law required.
So, now we study God’s law in order to more fully delight in God’s grace.
Some will contend that we have been delivered from the law and so interpret that to mean that we have nothing to do with the law. This is an unfortunate error in interpreting and thinking. The aspect of the law that we have been delivered from is the condemning aspect of the law. Because we are in Christ we are delivered from the law’s condemnation. There is, after all, therefore now no condemnation for those who are in Christ Jesus. However, deliverance from the law’s condemnation is not equal to the idea of no longer having anything to do with the law. This is why the inspired Apostle can say that; “The law is Holy, Righteous, and Good.”
Praise God for His kindness to usward as expressed by giving us His Law-Word. Praise God that the Lord Christ was and remains the embodiment and incarnation of God’s Law. To properly love God’s law is to love Christ. Correspondingly a lack of love for God’s Law-Word is a lack of love for Christ.