You are forgetting that anyone breaking the perfected laws of Christ that are all that can be conceived or known and made for any human being is based on the spirit of the original laws of God. And that breaking any one of them against a person or God directly can hamper our holiness (sanctification) indeed, if only temporarily. So even under grace, the law of Christ cannot boost or improve you sanctification with God either if you break the law as recognized by the spirit of Christ through the Father.
And the law is never only a few. With this kind of mentality it's no wonder you have not studied how and why the original law reveals all types of genuine sin placed within our heart. Today, the law and much more 'of it' is not written in the book of God, it is in our hearts. And I do not count the ceremonial and other cultural holy laws that God gave to the Hebrews here either.
I think you are missing the entire point here EG. I believe you are are so quick to identify yourself as for assurance I might add, as if you might be scared of the consequences of 'the law,' as to say you are saved by grace and you have an automatic 'get of sin card,' without any consequences. And further, you forget why you are forgiven today away for the harsh penalties when the imperfect law was the only devise God used on people, before Christ.
And then you brush it off as if the law was some prerequisite or an earlier experiment of God, in the past, and never to be spoken of again. You do know that because of God's grace we have the spirit of Christ. Without it we have the Law and no law under Christ? And where did you think that law came form? Yes, the law and more are written in our hearts today and we have a true Savior working in us to bring us or keep us holy and righteous. And we can truly thank the Father for that precious grace indeed.
The law is still standing there today as one of the witnesses of God for our age and not just the one before Christ, and is being killed off today in the churches and trodden underfoot. And this is where we get the hyper-grace theologies from and other extreme views that trivialize sin and the normalization and easy peasy formulation under grace to salvation. If you have faith and know you are saved from your sins, do you then bear your own cross today because of what the Savior did for you by paying with his own life and extracting you from your personal sin nature and imminent death?
The law will never go away as long as we are in the flesh. Have you ever stole anything directly or truly by accident or because of the error of an employee of a store.....so is this not the 'old' Law today still revealing sin in our hearts to Christ? And I do not weigh this upon you as I've been there several times, even a couple of months ago this happened to me.