In the Fullness of Time: God's Sovereign Advent

Paul writes to the Galatians: "When the fullness of time had come, God sent forth his Son, born of woman, born under the law." The word for fullness — pleroma — means the appointed completion. Not a moment too early. Not a moment too late. The exact moment in the sovereign plan of God when every condition was met, every providence aligned, every detail in place. Why then? Why not during Abraham's lifetime, or David's reign, or immediately after the exile? Because the fullness of time required a Roman Empire to build roads for the Gospel to travel. It required Greek to become the universal language so the New Testament could be understood everywhere. It required a Pax Romana — Roman peace — so missionaries could travel safely. It required four hundred years of prophetic silence so the hunger for God would be unbearable. God is not slow. God is sovereign. Isaiah saw this from the other side: "The people walking in darkness have seen a great light." The darkness was part of the plan. Not because God is the author of evil, but because God is the Lord of timing. He permits darkness so that the light, when it arrives, is unmistakable. He permits waiting so that the fulfillment, when it comes, is overwhelmingly sweet. Advent is the season that teaches the church to live in God's timing rather than our own. We want the answer now. God gives it in the fullness of time. We want the deliverance today. God sends it when every detail is in place. The Reformed heart of Advent is not impatience with God's timing — it is confidence in it. The God who scheduled the incarnation down to the census decree of a pagan emperor is the God who schedules your deliverance with equal precision.

Advent holds the church in the tension between two advents. The first coming — Bethlehem, the manger, the baby — has already happened. The second coming — the return of the King in glory to judge the living and the dead — has not yet happened. We live between the two. Already redeemed, not yet glorified. Already citizens of the kingdom, not yet residents of the new creation. Already victorious through the cross, not yet free from the effects of the fall. Isaiah's prophecy captures this tension. "For to us a child is born" — already. "Of the greatness of his government and peace there will be no end" — not yet. The child has come. The government of peace has not yet been fully established. We see the kingdom breaking in, but we also see the world breaking down. We see the light, but we also see the darkness. We live in the overlap. This is not a deficiency in God's plan. It is the shape of God's plan. The already/not-yet is where sanctification happens. It is where faith is exercised. It is where the church learns to hope — not the hollow hope of wishful thinking, but the robust hope of people who have seen the first advent and therefore trust the second. The Westminster Shorter Catechism asks: "What benefits do believers receive from Christ at death?" Answer: "The souls of believers are at their death made perfect in holiness, and do immediately pass into glory; and their bodies, being still united to Christ, do rest in their graves till the resurrection." Even death is an already/not-yet — already in glory, not yet resurrected. Advent teaches us to live in the tension without demanding premature resolution.

Advent hope is not generic optimism. It is covenant hope — grounded in the unbreakable promise of a God who cannot lie. When Isaiah prophesied, "A child is born, a son is given," he was extending the covenant line that began with Abraham, continued through David, and would culminate in Christ. Every Advent candle is a covenant marker. The first candle: the promise to Abraham — "Through your offspring all nations will be blessed." The second: the promise to David — "Your throne will be established forever." The third: the promise of the prophets — "A virgin will conceive and give birth to a son." The fourth: the promise fulfilled — "The Word became flesh and made his dwelling among us." The Reformed tradition confesses that "God's promises are yea and amen in Christ." Not some of them. All of them. The promises of forgiveness — kept. The promises of adoption — kept. The promises of perseverance — kept. The promises of glorification — as good as kept, because the God who began a good work will carry it on to completion. This is the Advent word for the weary: your hope is not in circumstances. Your hope is in the covenant. And the covenant is sealed by the blood of Christ, guaranteed by the resurrection of Christ, and will be consummated at the return of Christ. "Of the greatness of his government and peace there will be no end." That is not a wish. That is a covenant promise from the sovereign God. Light your candle. The promise holds.