J.M.J. "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."
--Saint John Paul II, Apostolic Letter Rosarium Virginis Mariae (October 16, 2002), 21.