In the mystery of light, apart from the miracle at Cana, the presence of Mary remains in the background. The Gospels make only the briefest reference to her occasional presence at one moment or other during the preaching of Jesus (cf. Mk 3:31-5; John 2:12), and they give no indication that she was present at the Last Supper and the institution of the Eucharist. Yet the role she assumed at Cana in some way accompanies Christ throughout his ministry. The revelation made directly by the Father at the Baptism in the Jordan and echoed by John the Baptist is placed upon Mary's lips at Cana, and it becomes the great maternal counsel which Mary addresses to the Church of every age: "Do whatever he tells you." (Jn 2:5) This counsel is a fitting introduction to the words and signs of Christ's public ministry and it forms the Marian foundation of all the 'mysteries of light'. (RVM, 21)

About eight days after saying this, he took Peter, John, and James, and went up onto a mountain to pray. While he was praying, his face changed in appearance and his clothes became dazzling white. Suddenly two men were talking with him, Moses and Elijah. They appeared in glory and spoke of his passage, which he was about to fulfill in Jerusalem. Peter and those with him had fallen into a deep sleep; but awakening, they saw his glory and likewise saw the two men who were standing with him. When these were leaving, Peter said to Jesus, "Master, how good it is for us to be here. Let us set up three booths, one for you, one for Moses, and one for Elijah." (He did not really know what he was saying.) While he was speaking, a cloud came and overshadowed them, and the disciples grew fearful as they entered it. Then from the cloud came a voice which said, "This is my Son, my Chosen One. Listen to him." When the voice fell silent, Jesus was there alone. The disciples kept quiet, telling nothing of what they had seen at that time to anyone. The mystery of light par excellence is the Transfiguration, traditionally believed to have taken place on Mount Tabor. The glory of the Godhead shines forth from the face of Christ as the Father commands the astonished Apostles to 'listen to him' (cf. Lk 9:35 and parallels) and to prepare to experience with him the agony of the Passion, so as to come with him to the joy of the Resurrection and a life transfigured by the Holy Spirit. (RVM, 21)

During the meal Jesus took bread, blessed it, broke it, and gave it to his disciples. "Take this and eat it," he said. "This is my body." Then he took a cup, gave thanks, and gave it to them. "All of you must drink from it," he said, "for this is my blood, the blood of the covenant, to be poured out in behalf of many for the forgiveness of sins. I tell you, I will not drink this fruit of the vine from now until the day when I drink it new with you in my Father?s reign." Then, after singing songs of praise, they walked out to the Mount of Olives. A final mystery of light is the institution of the Eucharist, in which Christ offers his body and blood as food under the signs of bread and wine, and testifies 'to the end' his love for humanity (Jn 13:1), for whose salvation he will offer himself in sacrifice. (RVM, 21)