Hmm ... just read it again..
Hebrews 8:10 says, “For this is the covenant which I will covenant with the house of Israel after those days, says the Lord: I will impart My laws into their mind, and on their hearts I will inscribe them; and I will be God to them, and they will be a people to Me.”
In Jeremiah’s prophecy law is singular, but here in the quotation it becomes laws. In other words, when this law was prophesied in the Old Testament time, it was one law, but when this law is applied in the New Testament time, it becomes a number of laws.
ddub..
I am not saying man is not saved by grace. I am not saying that Christians today should live by the principle of the law. We can't and we should NOT.
In between the covenant that God made with Abraham and the new covenant that the Lord enacted with His precious blood, there was the covenant of Moses. Moses, who, on the one hand, represented God, and on the other hand, represented Israel, enacted a covenant for the two parties, which covenant was the old covenant. The old covenant, referred to as "the first"; in Hebrews 8, was a covenant which was becoming old and growing decrepit and which was near to disappearing (vv. 13b, 7a). This first covenant was a covenant that should not have existed; it was not in God's plan but was added along the way. We may illustrate this in the following way: A person drives from Anaheim to the airport, and because he has no plan to see a doctor on the way, he expects to arrive at the airport in fifty minutes. However, along the way he has an accident and is injured. The car is pulled aside, while a policeman calls a doctor. This is the story of the law of the Old Testament. According to Romans 5, the law was something added; it was not something in the original plan but was inserted afterwards. The law is God's portrait, God's photograph; it is not God Himself. The photograph came first, and then the person Himself followed. The law is God's photograph, and grace is God Himself. Before God came, He first sent a picture to testify of Himself and also to expose man's real condition. God knew that man had fallen to such an extent that he was filled with the devil, having the devil's life and nature and even the devil himself, so that man could not walk according to God's law.
B. Grace Being for the New Covenant
in God's Economy, Which Is Also Called
the Second Covenant, the Better Covenant
When the Lord Jesus came (by God's incarnation), grace came. Grace is for the new covenant in God's economy, which is also called the second covenant, the better covenant (Heb. 8:13a, 7c, 6b). The law requires us to do something by ourselves; grace is God doing something for us. Actually, we do not have to do anything, and we cannot do anything. God does not require us to do anything; He does everything for us from the beginning to the end. It was God who carried out His incarnation, it was He who lived out His human living for thirty-three and a half years, it was He who accomplished the all-inclusive death on the cross, it was He who attained His entrance into resurrection, and it was He who accomplished His entrance into ascension. Everything was accomplished by Him. We just need to enter into His accomplishments and enjoy Him as our rest. This is grace.
God became flesh that He may enter into man and be mingled with man as one; this is Emmanuel. He is the God-man; He is God yet man, and man yet God. God and man became one in Him. This Emmanuel, the incarnated God, is grace for man's enjoyment (John 1:1, 14). Here we have One who was God becoming man, who was called Emmanuel and who was also called Jesus. He is grace. Grace is the embodied God. First, God as the Father was embodied in the Son, and then the Son was realized as the life-giving Spirit (1 Cor 15:45). This Spirit enters into us as grace for our enjoyment.
We must see what grace is. Grace is the embodiment of God, who became a God-man with divinity and humanity, passed through human living, died, resurrected, and entered into ascension. Now He has become the life-giving Spirit and is dwelling in us today.
This is why when the Lord came, He is the only One who fulfill the law (Matt 5.17). Here for Christ to fulfill the law means (1) that, on the positive side, He kept the law, (2) that, on the negative side, through His substitutionary death on the cross He fulfilled the requirement of the law, and (3) that in this section He complemented the old law with His new law, as repeatedly expressed by the word "But I say to (or, tell) you" (Matt 5:22, 28, 32, 34, 39, 44). Christ's keeping of the law qualified Him to fulfill the requirement of the law through His substitutionary death on the cross. Christ's fulfilling of the requirement of the law through His substitutionary death on the cross brought in the resurrection life to complement the law, to fill the law to the full. The old law, the lower law, with the demand that it be kept and the requirement that man be punished, is over. The kingdom people, as the children of the Father, now need to fulfill only the new law, the higher law, by the resurrection life, which is the eternal life of the Father. The old law was given through Moses, whereas the new law was decreed by Christ personally.
Now this One is in us as the grace for us to enjoy. He is now the indwelling One as the law of Spirit of life operating within us. We just turn to Him and let Him operates within us spontaneously. As we grow in Christ, Christ lived out of us fulfilling all the law. He did it .. not us.