The Eucharist, causal principle of the Church
14. Through the sacrament of the Eucharist Jesus draws the faithful into his "hour;" he shows us the bond that he willed to establish between himself and us, between his own person and the Church. Indeed, in the sacrifice of the Cross, Christ gave birth to the Church as his Bride and his body. The Fathers of the Church often meditated on the relationship between Eve's coming forth from the side of Adam as he slept (cf. Gen 2:21-23) and the coming forth of the new Eve, the Church, from the open side of Christ sleeping in death: from Christ's pierced side, John recounts, there came forth blood and water (cf. Jn 19:34), the symbol of the sacraments (30). A contemplative gaze "upon him whom they have pierced" (Jn 19:37) leads us to reflect on the causal connection between Christ's sacrifice, the Eucharist and the Church. The Church "draws her life from the Eucharist" (31).
Since the Eucharist makes present Christ's redeeming sacrifice, we must start by acknowledging that "there is a causal influence of the Eucharist at the Church's very origins" (32). The Eucharist is Christ who gives himself to us and continually builds us up as his body. Hence, in the striking interplay between the Eucharist which builds up the Church, and the Church herself which "makes" the Eucharist (33), the primary causality is expressed in the first formula: the Church is able to celebrate and adore the mystery of Christ present in the Eucharist precisely because Christ first gave himself to her in the sacrifice of the Cross. The Church's ability to "make" the Eucharist is completely rooted in Christ's self-gift to her. Here we can see more clearly the meaning of Saint John's words: "he first loved us" (1 Jn 4:19). We too, at every celebration of the Eucharist, confess the primacy of Christ's gift. The causal influence of the Eucharist at the Church's origins definitively discloses both the chronological and ontological priority of the fact that it was Christ who loved us "first." For all eternity he remains the one who loves us first.