Hi Stone,
I'm not referring to the Old Covenant. I'm referring to the New Covenant and asking how the law applies now.
It's the Law of Love.....Love God with all your heart, soul, mind and strength and love your neighbor as yourself.
If we love the Lord, by God's grace we will obey His commands. And by God's grace we're forgiven when we sin as we repent and confess our sin, He's faithful and just to forgive us and cleanse us from all unrighteousness.
The Law of Liberty....Being doers of the word and not hearers only.
But prove yourselves doers of the word, and not merely hearers who delude themselves. For if anyone is a hearer of the word and not a doer, he is like a man who looks at his natural face in a mirror; for once he has looked at himself and gone away, he has immediately forgotten what kind of person he was. But one who looks intently at the perfect law, the law of liberty, and abides by it, not having become a forgetful hearer but an effectual doer, this man will be blessed in what he does.
Romans 8:4 Therefore there is now no condemnation for those who are in Christ Jesus. For the law of the Spirit of life in Christ Jesus has set you free from the law of sin and of death. For what the Law could not do, weak as it was through the flesh, God did: sending His own Son in the likeness of sinful flesh and as an offering for sin, He condemned sin in the flesh, so that the requirement of the Law might be fulfilled in us, who do not walk according to the flesh but according to the Spirit.
When we're walking in the Spirit, the righteous requirements of the Law are met in us because we will obey the commands of Jesus that are now written on our hearts. We desire to obey now where before we didn't.
God changes our heart to not indulge the deeds of the flesh, but to walk in newness of Spirit. It becomes a joy to obey the commandments of the Lord.
That's what walking in the Spirit means, we are under the grace of God that works in us to do His good pleasure.