The Father wanted to reveal the divine glory of his Son even during Jesus’ earthly life. Christ’s Transfiguration was meant to help the disciples later to understand his death and Resurrection. [554-556,568]
Three Gospels related how Jesus, on the mountaintop, begins to shine(is “transfigured”) before the eyes of his disciples. The voice of his heavenly Father calls Jesus his “beloved Son”, to whom they are supposed to listen. Peter would like to “make three booths” and capture the moment. Jesus, however, is on the way that leads to suffering. The vision of glory is only to strengthen his disciples.