[T]he already-not-yet theme permeates Paul's writings. For instance, believers are indwelt by the Holy Spirit now, but the Spirit is the guarantee of our future inheritance (Eph. 1:13-14). Believers are adopted as God's children now, and yet they await their final adoption in the Resurrection (Eph. 1:5; Rom. 8:23). Speaking of the Resurrection, the new age has dawned with the resurrection of Christ (Rom. 1:4), and yet Christians will not enjoy the resurrection of the body until the last day (1 Cor. 15:20-28). The new creation has arrived in Christ, but we await the day when the created order is liberated from its slavery (Rom. 8:18-25).
~ Thomas Schreiner