From Herman Ridderbos’s classic book Paul: An Outline of His Theology, page 57:

Paul’s kerygma [message] of the great time of salvation that has dawned in Christ is above all determined by Christ’s death and resurrection. It is in them that the present aeon has lost its power and hold on the children of Adam and that the new things have come. For this reason, too, the entire unfolding of the salvation that has dawned with Christ again and again harks back to his death and resurrection, because all the facets in which this salvation appears and all the names by which it is described are ultimately nothing other than the unfolding of what this all-important breakthrough of life in death, of the kingdom of God in this present world, contains within itself. Here all lines come together, and from hence the whole Pauline proclamation of redemption can be described in its unity and coherence. Paul’s preaching, so we have seen, is “eschatology,” because it is preaching the fulfilling redemptive work of God in Christ. We might be able to delimit this further, to a certain extent schematically, by speaking of Paul’s “resurrection-eschatology.” For it is in Christ’s death and subsequent resurrection that the mystery of the redemptive plan of God has manifested itself in its true character and that the new creation has come to light.