Paul wrote the objection into his own letter before anyone in Rome could raise a hand
The question is old enough that Paul heard it in his own lifetime, and he thought it was worth answering in ink. If God has forgiven everything, past, present, and future, what keeps a person from doing whatever he wants? Before any hand goes up, Paul states the objection himself, in the bluntest terms he can find, and then he answers it.
What shall we say then? Shall we continue in sin that grace may abound? Certainly not! How shall we who died to sin live any longer in it? (Romans 6:1-2)
Look at what Paul reaches for. Instead of a rule, a warning, or a probationary period, he answers with a fact about who these people are, and the fact is a death. His counter-question comes out sounding almost bewildered. How does a man go on living inside the thing he died to?
The rest of the chapter runs on that. Paul spends the next twenty verses explaining what happened to his readers, and when he does give an instruction, it grows straight out of what he's just told them: "present yourselves to God as being alive from the dead" (Romans 6:13). Identity comes first, and behavior follows from it. Grace is no more a license to sin than electricity is a license to electrocute yourself. Both are power, and both were given so you could live.
Why the Law Made Sin Stronger
Beneath the objection sits an assumption almost nobody examines. Sin is held in check by pressure, so remove the pressure and sin surges. It sounds like common sense. Paul says the reverse, in a line so compressed that most readers slide right past it.
The sting of death is sin, and the strength of sin is the law. (1 Corinthians 15:56)
Sin has a power supply, and Paul names it. The law is what gives sin its grip. It defines the transgression, draws the line that makes crossing possible, and wakes the appetite it forbids. Paul watched it happen inside himself and didn't flinch describing it. Sin, he says, "taking opportunity by the commandment, produced in me all manner of evil desire" (Romans 7:8). The command located the desire, named it, and made it interesting.
So what happens when you install the safeguard everyone keeps asking for? You hand sin the one thing that gives it a foothold. That's why Romans 6 lands where it does.
For sin shall not have dominion over you, for you are not under law but under grace. (Romans 6:14)
Look at the small word for. It shows up twice, and both times it's giving a reason. Sin won't rule you, and here's why. You were moved out from under the system that supplied sin its strength and placed under the One who finished the matter entirely. And for what it's worth, nobody under the law of Moses ever needed a license to sin. They managed just fine with the commandments sitting right in front of them.
What Fear Can and Cannot Do
Fear does restrain behavior, and it works fast, which is exactly why religion keeps reaching for it. Threaten a person with consequences and you'll usually have compliance by the weekend. But speed isn't freedom. Fear produces a man who does nothing wrong on Sunday and wants everything wrong on Monday. It has managed him without changing him.
So who does Paul put in charge of real transformation? The last thing anyone expects.
For the grace of God that brings salvation has appeared to all men, teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly in the present age. (Titus 2:11-12)
Grace teaches. That's Paul's own verb, and he hands grace the exact curriculum people are afraid grace will abandon. Sobriety. Righteousness. Godliness. The outcomes fear gets recruited to produce are the outcomes Paul credits to grace, and grace gets them by changing what a person wants.
The verse usually quoted on the other side is Jude 4, which warns about men "who turn the grace of our God into lewdness." Read it in place and Jude is describing intruders who "deny the only Lord God and our Lord Jesus Christ," men he calls "not having the Spirit" (Jude 19). Receiving too much grace wasn't their trouble, because they'd swapped grace out for something else and let go of the Lord to do it. Who Turned Grace into Lewdness? walks through the whole letter.
The Slave Died
Grace doesn't claim sin is harmless. It claims sin is no longer your master, and it makes that claim on the basis of an execution that's over and done. Jesus drew the same line between slave and son in John 8; see Abiding in the Truth: What It Is and What It’s Not.
Knowing this, that our old man was crucified with Him, that the body of sin might be done away with, that we should no longer be slaves of sin. (Romans 6:6)
Read the purpose clause at the end of that verse. The crucifixion of the old man had an aim, and Paul spells it out: so that you'd no longer serve. That's what God promised long before the cross through Ezekiel, who heard the Lord say He would give His people a new heart and put a new spirit within them, taking out the heart of stone and giving a heart of flesh (Ezekiel 36:26). Grace rests on that new creation and doesn't need fear standing behind it as a backup plan.
What a Freed Man Does With an Open Door
Picture a man who's served a long sentence and is finally released. The gate opens behind him, and for months afterward he still asks permission before he uses the bathroom. He makes his bed to a fold someone taught him who has no authority over him anymore. He eats fast. He flinches when a door swings shut. Nobody's holding him, and his body hasn't been told.
The release was complete the moment the gate opened. What takes longer is the reflex, trained under a system that has no claim on him at all. Plenty of believers live that way for years, free in fact and still reporting to a warden who was dismissed at the cross, and most of them could quote you the verse that says otherwise.
That's why Paul keeps telling the Romans what's true of them. Before he asks anything of a man, he tells him, at length and in detail, that he was let out.
The Question You Carry Through the Week
Grace feels dangerous because it keeps no outside pressure in reserve. It trusts what Christ finished, it trusts the Spirit at work in you, and it trusts the new heart God promised to give. To anyone who's only ever been moved by consequences, that looks like a car with the brake lines cut. So which question do you carry through an ordinary week? A man under law wants to know how close he can get to the line without crossing it. A man who's died to sin wants to know why he'd walk back toward something that doesn't own him anymore.
Stand fast therefore in the liberty by which Christ has made us free, and do not be entangled again with a yoke of bondage. (Galatians 5:1)
The warning at the end of that verse is the half people skip. The danger Paul names is a free man walking back through the gate and calling it safety. The gate's open behind you, nobody's posted at it, and the road out front belongs to you.
