“Christ died and lived again, that he might be Lord both of the dead and of the living.” Christ’s Ascension into heaven signifies his participation, in his humanity, in God’s power and authority. Jesus Christ is Lord: he possesses all power in heaven and on earth. He is “far above all rule and authority and power and dominion”, for the Father “has put all things under his feet.” Christ is Lord of the cosmos and of history. In him human history and indeed all creation are “set forth” and transcendently fulfilled.
As Lord, Christ is also head of the Church, which is his Body. Taken up to heaven and glorified after he had thus fully accomplished his mission, Christ dwells on earth in his Church. the redemption is the source of the authority that Christ, by virtue of the Holy Spirit, exercises over the Church. “The kingdom of Christ (is) already present in mystery”, “on earth, the seed and the beginning of the kingdom”.
Since the Ascension God’s plan has entered into its fulfilment. We are already at “the last hour”. “Already the final age of the world is with us, and the renewal of the world is irrevocably under way; it is even now anticipated in a certain real way, for the Church on earth is endowed already with a sanctity that is real but imperfect.” Christ’s kingdom already manifests its presence through the miraculous signs that attend its proclamation by the Church.
“. . . until all things are subjected to him”
Though already present in his Church, Christ’s reign is nevertheless yet to be fulfilled “with power and great glory” by the King’s return to earth. This reign is still under attack by the evil powers, even though they have been defeated definitively by Christ’s Passover. Until everything is subject to him, “until there be realized new heavens and a new earth in which justice dwells, the pilgrim Church, in her sacraments and institutions, which belong to this present age, carries the mark of this world which will pass, and she herself takes her place among the creatures which groan and travail yet and await the revelation of the sons of God.” That is why Christians pray, above all in the Eucharist, to hasten Christ’s return by saying to him: Maranatha! “Our Lord, come!”
Before his Ascension Christ affirmed that the hour had not yet come for the glorious establishment of the messianic kingdom awaited by Israel which, according to the prophets, was to bring all men the definitive order of justice, love and peace. According to the Lord, the present time is the time of the Spirit and of witness, but also a time still marked by “distress” and the trial of evil which does not spare the Church and ushers in the struggles of the last days. It is a time of waiting and watching.
From the Catechism of the Catholic Church 668-672