NewCovenant

The New Covenant is a Better Covenant. It is actually the best and final Covenant of this age.

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. -

The better covenant is Grace Through Faith which is offered to all humanity.

Christ Jesus is God and He has reconciled us to Himself because He is the perfect mediator.

For 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 Mosaic Covenant was a teacher. The New Covenant is Perfect because its requirements fell one-sidedly to a Perfect Saviour.

In that he saith, A new covenant, he hath made the first old.     Now that which decayeth and waxeth old is ready to vanish away. -
Paul preached the Gospel of Grace Through Faith which stands completely on its own with no dependence on prior covenants or standards for righteousness.
However, some believers then and now still hang on to performance aspects of the law as requirements for Spirit Salvation.     This is error.
Forgiveness of sins is a done deal ()
Eternal Life in the New Birth comes by faith in Christ Jesus ()
We then walk by faith in the Word so that we experience Abundant Life ()
Salvation is two-part: Spirit Salvation and Soul Salvation.

And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than that of Abel. -
We are In Christ. We are One with the Father.