The New Covenant is different from the previous one. For starters, the previous covenant was a collective, or a group covenant, and included all manner of people within the nation of Israel, both believer and unbeliever alike, both elect and reprobate alike. The New Covenant, as described by God in Jeremiah 31, is quite different in that it is NOT LIKE the one made before it, which those within it broke. The New Covenant is a specific, or personal covenant, one in which every member meets the description which God has put forth. The New Covenant, according to God in Jeremiah 31, is one in which ALL those who are granted access to it are believers, all are elect. Jeremiah records God saying that, in the New Covenant, they (those who are in it) will all know Him, they (those who are in it) will all have His law written on their hearts and minds, and they (all those within it) will all have their iniquity forgiven and their sin remembered no more.
Paul, in 2 Corinthians, Chapter 6, demonstrates that this is a present reality and not something which is yet to happen. Unlike the previous covenant which purposefully included believer and unbeliever alike, those within the New Covenant are instructed to, first of all, not yoke themselves to unbelievers and, second of all, to remove unbelievers from their midst. Here is what Paul says:
Do not be unequally yoked with unbelievers. For what partnership has righteousness with lawlessness? Or what fellowship has light with darkness? What accord has Christ with Belial? Or what portion does a believer share with an unbeliever? What agreement has the temple of God with idols? For we are the temple of the living God; as God said, I will make my dwelling among them and walk among them, and I will be their God, and they shall be my people. Therefore go out from their midst, and be separate from them, says the Lord,and touch no unclean thing; then I will welcome you, and I will be a father to you, and you shall be sons and daughters to me, says the Lord Almighty. - 2 Cor. 6:14-18
Why does Paul instruct those within the church not to join in any endeavors with unbelievers? I think one reason is because those truly within the church, the body of Christ, had been specially called out from the world. They were members of a New Covenant, one in which there was to be no inclusion of those in the world.
Paul also says, “we ARE the temple of the living God”. Here and now, not sometime in the future, but right here, and right now. The true church, the body and Bride of Christ IS the temple of the living God. The context of what Paul is saying is that, God has already made His dwelling among those who have Christ, He IS their God, and they ARE His people.
This is not some future promise for us. This a present reality. Therefore, we are to keep Christ’s body holy, clean, pure and righteous, as Paul said, “what fellowship has light with darkness?”


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Beauty Will Rise - Steven Curtis Chapman



