In his encyclical on the Eucharist, John Paul reminds us that the Eucharist points us forward to eternal life with all the saints in heaven – and that our longing for eternal life “increases, rather than lessens, our sense of responsibility for the world today.”
The acclamation of the assembly following the consecration appropriately ends by expressing the eschatological thrust which marks the celebration of the Eucharist (cf. 1 Cor 11:26): “until you come in glory”. The Eucharist is a straining towards the goal, a foretaste of the fullness of joy promised by Christ (cf. Jn 15:11); it is in some way the anticipation of heaven, the “pledge of future glory”. In the Eucharist, everything speaks of confident waiting “in joyful hope for the coming of our Saviour, Jesus Christ”. Those who feed on Christ in the Eucharist need not wait until the hereafter to receive eternal life: they already possess it on earth, as the first-fruits of a future fullness which will embrace man in his totality. . . .
The eschatological tension kindled by the Eucharist expresses and reinforces our communion with the Church in heaven. It is not by chance that the Eastern Anaphoras and the Latin Eucharistic Prayers honour Mary, the ever-Virgin Mother of Jesus Christ our Lord and God, the angels, the holy apostles, the glorious martyrs and all the saints. This is an aspect of the Eucharist which merits greater attention: in celebrating the sacrifice of the Lamb, we are united to the heavenly “liturgy” and become part of that great multitude which cries out: “Salvation belongs to our God who sits upon the throne, and to the Lamb!” (Rev 7:10). The Eucharist is truly a glimpse of heaven appearing on earth. It is a glorious ray of the heavenly Jerusalem which pierces the clouds of our history and lights up our journey.
A significant consequence of the eschatological tension inherent in the Eucharist is also the fact that it spurs us on our journey through history and plants a seed of living hope in our daily commitment to the work before us. Certainly the Christian vision leads to the expectation of “new heavens” and “a new earth” (Rev 21:1), but this increases, rather than lessens, our sense of responsibility for the world today. I wish to reaffirm this forcefully at the beginning of the new millennium, so that Christians will feel more obliged than ever not to neglect their duties as citizens in this world. Theirs is the task of contributing with the light of the Gospel to the building of a more human world, a world fully in harmony with God’s plan.
. . . Significantly, in their account of the Last Supper, the Synoptics recount the institution of the Eucharist, while the Gospel of John relates, as a way of bringing out its profound meaning, the account of the “washing of the feet”, in which Jesus appears as the teacher of communion and of service (cf. Jn 13:1-20). The Apostle Paul, for his part, says that it is “unworthy” of a Christian community to partake of the Lord’s Supper amid division and indifference towards the poor (cf. 1 Cor 11:17-22, 27-34).
–Bl. John Paul II, Ecclesia de Eucharistia