The law of love is His commandment for us, that we not only love God but that we also love one another.
1 John 4:21 And this commandment have we from him, That he who loveth God love his brother also.
Romans 13:8 Owe no man any thing, but to love one another: for he that loveth another hath fulfilled the law.
FAL is looking at this from the point of view of what is seen in the manner of our walk rather than we are walking/living in the Spirit and we will not practice a sinful way of life because it is grievous to us and Him because He dwells within us.
The problem is that it is a matter of choice.
When we leave off following Him we grieve Him and quench His influence in our lives which leads to chatisement.
So it is primarily that we are walking in the Spirit in the law of love and the commandments of love rather than trying to keep the letter of the law of moses (all or partially).
NKJV 1 Corinthians 13
1 Though I speak with the tongues of men and of angels, but have not love, I have become sounding brass or a clanging cymbal.
2 And though I have the gift of prophecy, and understand all mysteries and all knowledge, and though I have all faith, so that I could remove mountains, but have not love, I am nothing.
3 And though I bestow all my goods to feed the poor, and though I give my body to be burned, but have not love, it profits me nothing.
4 Love suffers long and is kind; love does not envy; love does not parade itself, is not puffed up;
5 does not behave rudely, does not seek its own, is not provoked, thinks no evil;
6 does not rejoice in iniquity, but rejoices in the truth;
7 bears all things, believes all things, hopes all things, endures all things.
...
11 When I was a child, I spoke as a child, I understood as a child, I thought as a child; but when I became a man, I put away childish things.
12 For now we see in a mirror, dimly, but then face to face. Now I know in part, but then I shall know just as I also am known.
13 And now abide faith, hope, love, these three; but the greatest of these is love.
Love (agape-God's indwelling love) will keep one from hurting his/her neighbor, stealing his/her neighbors goods, stealing his/her spouse, lusting after what is his/hers, etc...
HankD