13. Jesus gave this act of oblation an enduring presence through his institution of the Eucharist at the Last Supper. He anticipated his death and resurrection by giving his disciples, in the bread and wine, his very self, his body and blood as the new manna (cf. Jn 6:31-33). The ancient world had dimly perceived that man's real food—what truly nourishes him as man—is ultimately the Logos, eternal wisdom: this same Logos now truly becomes food for us—as love. The Eucharist draws us into Jesus' act of self-oblation. More than just statically receiving the incarnate Logos, we enter into the very dynamic of his self-giving. The imagery of marriage between God and Israel is now realized in a way previously inconceivable: it had meant standing in God's presence, but now it becomes union with God through sharing in Jesus' self-gift, sharing in his body and blood. The sacramental “mysticism”, grounded in God's condescension towards us, operates at a radically different level and lifts us to far greater heights than anything that any human mystical elevation could ever accomplish.
14. Here we need to consider yet another aspect: this sacramental “mysticism” is social in character, for in sacramental communion I become one with the Lord, like all the other communicants. As Saint Paul says, “Because there is one bread, we who are many are one body, for we all partake of the one bread” (1 Cor 10:17). Union with Christ is also union with all those to whom he gives himself. I cannot possess Christ just for myself; I can belong to him only in union with all those who have become, or who will become, his own. Communion draws me out of myself towards him, and thus also towards unity with all Christians. We become “one body”, completely joined in a single existence. Love of God and love of neighbour are now truly united: God incarnate draws us all to himself. We can thus understand how agape also became a term for the Eucharist: there God's own agape comes to us bodily, in order to continue his work in us and through us. Only by keeping in mind this Christological and sacramental basis can we correctly understand Jesus' teaching on love. The transition which he makes from the Law and the Prophets to the twofold commandment of love of God and of neighbour, and his grounding the whole life of faith on this central precept, is not simply a matter of morality—something that could exist apart from and alongside faith in Christ and its sacramental re-actualization. Faith, worship and ethos are interwoven as a single reality which takes shape in our encounter with God's agape. Here the usual contraposition between worship and ethics simply falls apart. “Worship” itself, Eucharistic communion, includes the reality both of being loved and of loving others in turn. A Eucharist which does not pass over into the concrete practice of love is intrinsically fragmented. Conversely, as we shall have to consider in greater detail below, the “commandment” of love is only possible because it is more than a requirement. Love can be “commanded” because it has first been given.
15. This principle is the starting-point for understanding the great parables of Jesus. The rich man (cf. Lk 16:19-31) begs from his place of torment that his brothers be informed about what happens to those who simply ignore the poor man in need. Jesus takes up this cry for help as a warning to help us return to the right path. The parable of the Good Samaritan (cf. Lk 10:25-37) offers two particularly important clarifications. Until that time, the concept of “neighbour” was understood as referring essentially to one's countrymen and to foreigners who had settled in the land of Israel; in other words, to the closely-knit community of a single country or people. This limit is now abolished. Anyone who needs me, and whom I can help, is my neighbour. The concept of “neighbour” is now universalized, yet it remains concrete. Despite being extended to all mankind, it is not reduced to a generic, abstract and undemanding expression of love, but calls for my own practical commitment here and now. The Church has the duty to interpret ever anew this relationship between near and far with regard to the actual daily life of her members. Lastly, we should especially mention the great parable of the Last Judgement (cf. Mt 25:31-46), in which love becomes the criterion for the definitive decision about a human life's worth or lack thereof. Jesus identifies himself with those in need, with the hungry, the thirsty, the stranger, the naked, the sick and those in prison. “As you did it to one of the least of these my brethren, you did it to me” (Mt 25:40). Love of God and love of neighbour have become one: in the least of the brethren we find Jesus himself, and in Jesus we find God.