I'll bounce off just that one to get started here.
To me it's a simple as your verse there when it comes to sin we are willing to repent of, and even if we repeat that sin/sinning, there is the 7X70 clause. Most won't require that clause, or not so much anyway, but God figures if we do, and as long as they ask with sincerity, they will be forgiven. So pretty simple stuff there, and actually not a new concept at all, Atheist, Christians whoever often go with, "just make a genuine effort" and you'll be fine. To me that's all the forgiveness process is about, a genuine effort. One that should be taken very seriously and has a process we must follow, but still, just that. Not complicated at all.
However, there are written rules, they are written in the commandments, they are written again in several lists throughout the NT that if we choose a lifestyle of sin, either just blatantly, or we rely on some made up theology, that some actually do say allows them to sin all they like, unrepentant, without asking forgiveness (because Christ already died for those sins is their excuse) we are going to be in big trouble.
Some say, I" don't need a set of rules", well evidently God had a different idea there, made evident by scripture/his word, and just to mention a very few, Christs Sheep/Goat parable, and the many lists of sin throughout the NT, we cannot do, or we will not see the kingdom of God . Their points are undeniable regardless how some choose to try to change their meaning. They cover proving our faith and that we should not live a life of unrepentant sin, do or die.
Please read the scripture below, which we've posted for the umpteenth time on these boards, and tell me those are not written rules we need to follow? Show me how the message is the least bit confusing in any one of them? Or where it so much as indicates those people the warning is given too can't be anyone who does those things, whether they claim they are saved or not, or whatever the spin?
Again this post is directed in general, and all questions are rhetorical, but it's fine to address them if you like.
1 Cor 6:9-10 Or do you not know that wrongdoers will not inherit the kingdom of God? Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers nor homosexual offenders, nor thieves nor the greedy nor drunkards nor slanderers nor swindlers will inherit the kingdom of God. And that is what some of you were.
Gal 5:19-21 The acts of the flesh are obvious: sexual immorality, impurity and debauchery; idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissensions, factions and envy; drunkenness, orgies, and the like. I warn you, as I did before, that those who live like this will not inherit the kingdom of God.
Eph 5:3-6 But among you there must not be even a hint of sexual immorality, or of any kind of impurity, or of greed, because these are improper for God’s holy people. Nor should there be obscenity, foolish talk or coarse joking, which are out of place, but rather thanksgiving. For of this you can be sure: No sexually immoral, impure or greedy person—such a person is an idolater—has any inheritance in the kingdom of Christ and of God. Let no one deceive you with empty words, for because of such things God’s wrath comes on those who are disobedient. Therefore do not be partners with them.
Rev. 22:12-16 “Look, I am coming soon! My reward is with me, and I will give to each person according to what they have done. I am the Alpha and the Omega, the First and the Last, the Beginning and the End. “Blessed are those who wash their robes, that they may have the right to the tree of life and may go through the gates into the city. Outside are the dogs, those who practice magic arts, the sexually immoral, the murderers, the idolaters and everyone who loves and practices falsehood. “I, Jesus, have sent my angel to give you this testimony for the churches. I am the Root and the Offspring of David, and the bright Morning Star.”