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Paul states the change to the New was better Promises.
For a Covenant/contract to be valid and enforceable, both parties must offer something of value to the other party.
In the sale of a home, the seller offers the home, the buyer offers money, in a normal situation.
what the buyer offers is called "the consideration"
The consideration in the Old C, Israel had to obey the voice of God i.e. The Torah
God offered physical blessings such as rain in season, protection ect. Lev 26
the only change to the New C, as per Paul, God was offering to those that obeyed His Voice, eternal life and His Holy Spirit.
And it was the shed blood of Christ that made eternal life possible.
6 But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.
7For if that first [covenant] had been faultless, then should no place have been sought for the second.
8For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
the only problem with the old, Israel could not do what they agreed to do -- they could not obey every word or even a few.
What is it a "Christian" offers as their "consideration"?
The many will say "Belief"
Christ says "living by every Word of God". which is the same consideration in the OLD
in the New, God gives the person that repents of sin, His Holy Spirit which begins to put in a person the Holy Divine nature of God.
That Divine nature is the power to obey, to do the will of the Father.
The Old covenant is physical contract for a physical people with a physical law and physical promises and a physical priesthood
the New is a spiritual contract for a spiritual people with a spiritual law and spiritual promised and a spiritual priest.
The major change, the covenant was raised from only physical up to spiritual which raised the promise to spiritual.
the Old can not vanish until there are no physical Israelite's.
both parties must agree before even a completed contract can be null and void.
After a home is sold and the buyer is living in the home, the buyer can sue under that contract for latent defects. undisclosed defects the seller knew about.
The Old T gives the covenant in detail, the New T does not.
why? That knowledge is for a spiritual people and is given by God to only those He is calling to Christ, Many are called, few are chosen.
If the Bible was 100% understandable, there would not be tens of thousands of diverse churches, only one.