Covenants and Eschatology

The Covenants of Works and Grace, taken individually, illustrate the question discussed in previous posts, whether grace came to support the establishment of justice, or whether justice came to support the establishment of grace.  I have provisionally identified much later, "orthodox" Reformed Theology as tending to be based in the former (grace comes to establish justice), and the earlier "orthodox" Reformed Theology (Calvin) as tending to be based in the latter (justice comes to support the establishment of grace and mercy).

When grace comes to establish justice, then the Covenant of Works is the lead covenant, and the Covenant of Grace comes to repair the Fall by the work of Christ, and then, by grace, to make possible the fruition of the Covenant of Works established at the Creation.  On the other hand, when justice comes to support the establishment of grace and mercy, then the Covenant of Grace is the primary covenant, and the Covenant of Works is instrumental in establishing the reign of grace, in a just manner.  In this case, eschatology is taken up with the eternally planned fulfillment of the Covenant of Grace, not the Covenant of Works.  And, since the Covenant of Grace has eternally been based in the work of Christ, the fruition of this Covenant cannot be the Covenant of Works established with Adam, but can only be the fruition of the Covenant of Grace established and administered through Christ.  This means that the fruition is not something that takes place in this age, but takes place in the age of resurrection.

Now those who believe that fruition comes through the Covenant of Works believe in the resurrection also, and in the eternal state resulting from it.  But, the main outworking of the Covenant is the outworking of that covenant that was intended to be carried unto fruition in Adam and his offspring, which is a covenant that is carried out under the auspices of the present age.  The fruition of the Covenant of Grace, being a covenant of union with the resurrected Christ, is a covenant which reaches its fruition in the age to come, not the present age.

This is a major difference in eschatology, with, in my opinion, major differences in its effect on practical ecclesiology.  Do we see ourselves primarily as engaged in carrying out a vision which conquers the present age?  Or, do we see ourselves primarily as engaged in carrying out a vision which conquers through resurrection at the return of Christ for judgment and rewards?

One would be hard-pressed to make the New Testament, which is the eschatological hermeneutic for all Scripture, say anything but the latter!