Noted theologian O. Palmer Robertson's three-volume The Christ of the Consummation explores progressive revelation across the redemptive history of the New Testament. The second volume, The Testimony of Acts and Paul, focuses on the ongoing redemptive realities that stretch beyond "all that Jesus began to do and teach" (Acts 1:1), as witnessed through the testimony of Acts, conjoined with the writings of Paul and the other New Testament authors. Fifty days after his crucifixion at Passover, the resurrected and ascended Christ's outpouring of the Holy Spirit at Pentecost inaugurates a new age clearly marked on the ongoing time clock of redemptive history. By means of the Spirit, the exalted Christ works supernaturally through the church to fulfill God's promises.