Jesus said that if you hate your brother, you have already killed him - in our heart.
However, some distinction must be made between the Mosaic Covenant and the New Covenant. Otherwise why would there have to be a new one?
The law of Moses, the 10 commandments or decalogue (10) was written on STONE. The freed slaves, Israelites, declared to Moses that they would keep the commandments. But they could not.
Let’s remember too, that the 10 commandments were also given to show man what sin is. It always existed but was not known to them having been in captivity for about 400 years (well, not really but it would get too long).
The New Covenant allows God’s laws to be written on the heart. Thus we are more able to keep them. I say more able because of concupiscense.
The only covenant in existance back at Adam and Eve’s time were the Edenic Covenant and the Adamic Covenant so, of course the New didn’t exist yet.
Now we could go back and forth with the wording of the CCC but keeping it simple you’d have to agree that a big difference does exist between the Old and New Covenants and that the heart condition would have to be that big difference.
Of course Jesus fulfilled the law. Absolutely the civil law, since that disappeared with the destruction of Jerusalem and the temple. But also the moral law - but that’s a long topic for a different day. I do not mean to say that the moral law is abolished, the 10 commandments still stand.
So keeping it simple: The Old Covenant - written on stone - difficult to keep law.
The New Covenant - written on heart - easier to keep law.
God bless you
For sure there are distinctions between the Natural, Edenic and Mosaic Laws. And also Canon Law. And, roughly speaking, these laws correspond with the various Covenants God has made with man. And it’s also true that man has been at odds with these laws virtually from the beginning of his creation.
We can also see that there are varying levels of the law. All law governs how we behave. All law does. Even physical and scientific laws. The nature of a law is that it is a rule of behaviour laid down by a competent and legitimate authority. This is why God’s law is the highest, because He is the highest and most competent authority.
All law, moreover, must agree with all higher laws, otherwise such lower laws are pretending to have greater authority than they actually do. Such pretension leads to the violation of true law, which is God’s law, and therefore sin.
You will notice there are different degrees of oversight that these various laws have over human behaviour. I believe the level of progressive oversight looks something like this, ranging from the least oversight to the most:
- Edenic Law
- Natural Law
- Canon Law
- Mosaic Law
Edenic Law was simple; there was only one command: do not partake of the knowledge of good and evil. I generally take that to mean, “Do not sin.” But how could they sin, if there were no other stated laws? The answer should be manifestly simple: God’s law was already written on their hearts. Adam and Eve had friendship with God. They had no inclination to sin. They were simply inclined to goodness, to obedience. They didn’t need to be told “don’t do this, or do that.” They did not sin because they didn’t want to, and they did good because they wanted to, not because they had to be told.
After they sinned, however, their natures were damaged. They became inclined to sin. And with each passing generation, they became more deeply wicked. This is why the Mosaic law was given. It governed every aspect of their lives. It was especially concerned with cleansing laws, and how to make one acceptable before God.
But, the heart of man was still inclined to sin. The Mosaic Law was intended to reform man, but the result was only an outward reformation, a reformation of behaviour, but not of the heart.
When Jesus came, He exposed this hypocrisy. He lived a righteous live according to the Mosaic Law, but not because He HAD to, but because He WANTED to. And in this, He was alike to the first Adam in his original creation.
In the Canon Law of the New Covenant, cleansing laws have been done away with, as we have received the Sacraments to accomplish this, and no longer by our own power, but by allowing God to cleanse us. We still have laws to govern our behaviour, but they are broader, less specific. They are more like principles to live by, whereby we have the ability to judge for ourselves how to act under various circumstances. It does contain specific laws, to be sure, but these are far and away fewer than those of the Mosaic Law.
We also have access to Sanctifying Grace in the New Covenant. This is due to Christ’s own sacrifice. And with that Sanctifying Grace, we are made more like Jesus, less concupiscencial and desiring more and more to please God from our hearts. We, once again, have friendship with God.
It is not like Eden, though. We still suffer the effects of concupiscence. So we still need Canon Law. But the transformation that the Holy Spirit renders in us makes us less and less in need of that Law. Canon Law is designed to draw us out of concupiscence, rather than just kind of dealing with it, as it is.
Simply stated, the law of God that is written on the heart of man is that same law that was given to Adam in the Garden: “do not partake of the fruit of the tree of the knowledge of good and evil.” Do not sin. Do not harm our relationship. Live in harmony with Him who created you. Live in harmony with each other. Live in harmony with creation. This is what I created you for. This is our conscience. This is the simple law that governs all laws that have come after it.
Love God with your whole being. Love each other as yourself.
Adam and Eve simply broke this law, even though it was written on their hearts.