The miracle at Cana and the setting in which it was performed pre-figures: 1) the bride of Christ; 2) the bridegroom, i.e. the resurrected NC Temple; 3) the marriage of the two, i.e. through Baptism (six stone jars); and 4) the most intimate of nuptial unions through the sacrament of the Eucharist (the wedding feast of the lamb), from which the Church draws her life, i.e. the Holy Spirit [John Paul II, Ecclesia de Eucharistia , n. 1]. At the very beginning of his public ministry, Jesus (through the intercession of the future Mother of the Church) is telling us what would happen as a result of the accomplishment of his mission.
Furthermore, because the Church is the Mystical Body of Christ, Mary, via Jesus’ directions to John at the foot of the cross through which he teaches us that Mary is the Mother of all the living … those who are united to her Son through Baptism. As Mother of the Church, she intercedes for all the members of the Mystical Body.
“On the third day” are the very first words of the story of the miracle at Cana and they are quite significant. On the first day of John’s narrative, Jesus is baptized in the Jordan, foreshadowing the baptism of water and the Spirit, which is the rite of initiation into the nuptial mystery that is the Church that Jesus would build. On the third day of his public ministry, he performs the miracle at Cana. The timing of this event coincides with, and specifically points to, another very significant future event that would occur on the “third day”: the Resurrection of Jesus from the dead [Ratzinger Jesus of Nazareth Part One , 250]. It was Easter — the third day after His death on the cross. It was the day that he arose from the dead through the power of the Holy Spirit. It was the day when his body was spiritualized and glorified. It was the day of the arrival of the Kingdom of God/Kingdom of Heaven, which is the outpouring of the Holy Spirit [Durrwell, Holy Spirit of God , 38-39; CCC , n. 1287] in the person of Jesus Christ [Durrwell, Holy Spirit of God , 64 and 178-179].
“My hour has not yet come” (Jn. 2:4). What does he mean by his hour ? It is when Jesus dies and passes over to the Father [ CCC, n. 1085; Durrwell, Holy Spirit of God , 143-146]. … We can summarize the significance of the “third day” thusly: 1) on the third day after the start of Jesus’ public ministry, he performed a miracle that foreshadowed and summarized the entire purpose of his mission on earth; 2) his mission was the establishment and creation of His Church whom he would take as his bride, who would be purified in the waters of Baptism, through which she becomes one Mystical Body with the new and everlasting Temple; and 3) this mission would be accomplished through his Passover on the third day after the end of His public ministry [CCC, n.691].