The gist of it…Gentiles don’t have THE “written code” (Rom.2:27) but have THE “work” of the law on their heart, that is, no codified law of words but a functionality of right/wrong at work. There is a momentum within each and every person that reflects something of His maker’s original design, which is testified to by even their conduct (albeit not perfect) as its natural reaction to common injustice is retribution. Their consciences also bear witness to this reality in their inner man, though they do not credit God for such.
Those in Adam continue living according to the remnants of the first covenant made with man, that broken covt of works. Hence, fallen humanity limps along a path with some semblance of righteousness, and yet no law of Canaan or conscience will provide what it demands. These laws do not grant life but relentlessly demand what sinners cannot possibly render. Thus, *God did what the Law could not*, and He keeps on doing something within His people, even when they needlessly turn back to shadows and faded glory in hopes of becoming what they are.
God help us to understand that, what is obsolete (Mosaic covenant) is never to be resurrected, for it finds it’s end and incarnation in Chirst himself, the mediator of a better covenant.