yoke of bondage

Claudia, you have it half right and all wrong!

1) You are right that there were two laws, one eternal, the other added because of sin. But you are wrong on what that first law was. It was not the 10 Commandments, because those were directly addressed to ISRAEL, through Moses. IT does not matter whether God spoke directly or had Moses relay the info. The only reason God didn't give the whole Law directly to all of them is because they asked that He not, lest they die. (20:19) You are creating your own dichotomies, here. These passages you quote do NOT say "these commandments over here that are eternal are the Ten only", and "these over there that were added and pass away were all the others". And you omit "spiritual" laws. The first 3 commandments are not "moral". Morality is our relationship to man; spirituality is our relationship to God. And you do keep some of those other "Mosaic" Laws you claim are abolished!
The original universal law was what has been called the 7 Noahide laws. These are the true moral and spiritual laws that are universal to man. (Idolatry: Gen. 31:19-36; Blasphemy: Gen. 3:1-4, Murder: Gen. 4.8-10-16, 6:11, 9:6, Theft: Gen. 3:6, Gen. 31:19, Forbidden sexual relationships: Gen. 19:5-7, 20.3, Establishing courts of justice: Gen. 19:1-9, Eating the Limb of a Living Animal: Gen. 9.4-5--God has always expected these of us, even without commanding them, and with one not even in the Ten Commandments! They are in man's conscience). The sabbath is neither moral nor spiritual, but apart of the special code given to Israel to mark their identity (Ex.31:13).

2)Next, perfectly paralleling this, you are right that our old "marriage partner" was "sin/the flesh", but you're wrong in trying to make the Law a mere spectator that itself does the binding and loosing, but is itself not what we were bound and loosed from. Read the rest of Rom.7. Esp. v.6, and remember, "the letter" was ALL of them, including the ones WRITTEN on tablets of stone! (2 Cor.3:3) Because of our sin, nobody could keep the Law, so it only condemned them, and not only that, made them even more rebellious. Hence, the Law associated with "sin". A marriage covenant is A LAW. When the spouse dies, then the widow is not just freed from that spouse, but from that LAW tying her to him! So the solution was not simply slapping Jesus' name onto our attempts to keep the old laws, and just dumping only the bloody ones. A whole covenant changed, and while this does not say that Sunday is now holy, nobody here has even been arguing that!