On the last day of the Feast of Tabernacles the Lord proclaimed before the crowds, “If any one thirst, let him come to me and drink. He who believes in me, as the scripture has said, ‘Out of his heart shall flow rivers of living water.’ Now this he said about the Spirit, which those who believed in him were to receive; for as yet the Spirit had not been given, because Jesus was not yet glorified” (John 7:37-39). John goes on to interpret the saying as a reference to the giving of the Spirit as a result of his glorification.
John, by witnessing to the flow of blood and water, also attests that at his death Jesus constituted the Church. The Catechism affirms: “The blood and water that flowed from the pierced side of the crucified Jesus are types of Baptism and the Eucharist, the sacraments of new life (Cf. 19:34; 1 John 5:6-8). From then on, it is possible ‘to be born of water and the Spirit’ (Cf. John 3:5) in order to enter the Kingdom of God” (CCC 1225. Cf. Lumen Gentium ¶ 3). And again, “it was from the side of Christ as he slept the sleep of death upon the cross that there came forth ‘the wondrous sacrament of the whole Church’” (CCC 1067). From his heart, the symbol of divine mercy and love, all the Sacraments are given their power from the superabundant merit of Christ. The Church, constituted by the Sacraments of the Eucharist and Baptism, proclaims this great mystery by the power of that same Spirit given from the Cross and bestowed “not by measure” (John 3:34). The Holy One of God, Jesus continues to be present in the Church especially and really in the Most Holy Eucharist and so is with us always, even “to the close of the age” (Matthew 28:20).
Br. Paschal, MFVA