The good news of the gospel is that God has saved us and called us to a holy life — not because of anything we have done but because of His own purpose and grace. This grace was given us in Christ Jesus before the world began. This is essentially what Apostle Paul tells us in 1 Timothy 1:9. He says something similar in Ephesians 1:4: “For God chose us in Christ before the foundation of the world that we should be holy and blameless before him in love.”
We are saved by grace through faith (Ephesians 2:8). Saved by the grace of God granted us in Christ Jesus before the world began. Saved by the faithfulness of Jesus Christ. For we are God’s workmanship, God’s doing (not our own), created in Christ Jesus for good works, which God prepared beforehand that we should walk in them (Ephesians 2:10).
How were we chosen and created in Christ Jesus? It was not by anything we have done or ever could do. It is purely by the grace of God and the faithfulness of Jesus Christ before the world ever came to be. It is by the Incarnation, by which Christ united divinity with humanity, God with humankind — and eternity with time. It certainly happened in time, but by that union, time itself was transfigured by eternity. And so were we chosen and created in Jesus Christ, “the Lamb slain from the foundation of the world.” As as I have said elsewhere, Christ Crucified and Risen is the foundation of the world).
In our human frame, we think of past and present and future as three different moments, a linear succession. But there is really only one moment, the Eternal Moment. It is the moment of divine love and grace and faithfulness, the moment of the Incarnation, the moment of the Cross and Resurrection, the moment of Creation — and also the moment of the completeness and fulfillment of all things.
God made known to us the mystery of His will according to His good pleasure, which He purposed in Christ, to be put into effect when the times reach their fulfillment — to bring unity to all things in heaven and on earth under Christ. (Ephesians 1:9-10)
Our Lord Jesus Christ did not merely come in the fullness of time; he himself is the fullness of time. In him, time has come to its completion. What we experience as temporal succession, within our limited perspective, is in reality the fullness of time transformed by Jesus Christ, in whom all of time is revealed. It is one with the Eternal Moment, in which all things in heaven and on earth are brought to unity and summed up in Christ.