A couple of quotes from David Servant from his article (The Limits of God's Grace) below:
David Servant- "But how much grace did Jesus actually offer her? Was it unlimited and eternal? More specifically, did Jesus grant her a license to continue sinning?
Clearly He did not, as He said to her, "From now on sin no more" (John 8:11). That was a warning. It was just another way of saying, "Repent," something Jesus told everyone to do if they wanted to avoid ultimately perishing (see Luke 13:3-5).
Had that adulteress not repented, at death she would have encountered a Jesus who was not so merciful. Scripture plainly declares, "Do not be deceived; neither fornicators, not idolaters, nor adulterers...shall inherit the kingdom of God" (1 Cor 6:9-10). She would have been condemned to hell.
Clearly, the grace Jesus offered her was not forgiveness coupled with a license to sin. Rather, it was a temporary opportunity to repent of sin before she died and was condemned.
Biblical grace is anything but a license to sin. For example, Jude warned of the heretics of his day who were "turning the grace of God into licentiousness" (Jude 1:4). Those heretics, like their counterparts today, portray God's grace in such a way that leads people to think they can continue sinning with impunity."
David Servant- "God's grace carries with it other limitations. Scripture declares, "God is opposed to the proud, but gives grace to the humble" (Jas. 4:6). Although God is graciously offering forgiveness of sins to everyone, only those who humble themselves in repentance actually receive His gracious forgiveness. This is true for both unbelievers and believers who need forgiveness.
God's grace has been so perverted, however, that today some go so far as to teach that Christians need never ask forgiveness when they sin because Jesus has already forgiven them of all their sins, past, present and future. This is a tragic misconception in light of what Scripture teaches (see Matt. 6:12-15; 1 John 1:9).
One very popular evangelical teacher even uses the story of the Prodigal Son to make this erroneous point, showing how the prodigal's father ran to him, embraced and kissed him even before he could make his confession. The prodigal son, however, had already repented, and his return home and his rehearsed confession were proof of that. How would his father have responded if he had returned in a drunken stupor with a woman in each arm, asking for more money? Surely there would have been no party.
This understanding of biblical grace refutes the false idea that if there is any condition attached to the granting of mercy, it is not of grace but of works (as some claim). That is nonsense, because, as we just read, Scripture clearly states that God gives grace to people who meet a condition—that of humbling themselves. God's saving and eternal grace is very conditional—upon humble repentance and a living and continuing faith in the Lord Jesus Christ."
False teachers among Calvinism, it's branches like Free Grace theology, and other similar ideologies within Christianity which pervert God's grace into licentiousness have denied Jesus Christ through their deception. As a consequence, they are inviting their own sudden destruction from God. One of the major components of Free Grace theology is- they believe they have unlimited grace from God to sin as they think they are under a dispensation of grace from God. This is why they behave like sociopaths.
2 Peter 2:1-3 (NLT):
"But there were also false prophets in Israel, just as there will be false teachers among you. They will cleverly teach destructive heresies and even deny the Master who bought them. In this way, they will bring sudden destruction on themselves. 2 Many will follow their evil teaching and shameful immorality. And because of these teachers, the way of truth will be slandered. 3 In their greed they will make up clever lies to get hold of your money. But God condemned them long ago, and their destruction will not be delayed."
Jude 1:4 (NLT):
"I say this because some ungodly people have wormed their way into your churches, saying that God’s marvelous grace allows us to live immoral lives. The condemnation of such people was recorded long ago, for they have denied our only Master and Lord, Jesus Christ."