The Collect
O God, who on the holy mount revealed to chosen witnesses your well-beloved Son, wonderfully transfigured, in raiment white and glistening: Mercifully grant that we, being delivered from the disquietude of this world, may by faith behold the King in his beauty; who with you, O Father, and you, O Holy Spirit, lives and reigns, one God, for ever and ever. Amen.
The Psalm
99
Exodus 34:29-35 + II Peter 1:13-21 + Luke 9:28-36
Now about eight days after these sayings Jesus took with him Peter and John and James, and went up on the mountain to pray. And while he was praying, the appearance of his face changed, and his clothes became dazzling white. Suddenly they saw two men, Moses and Elijah, talking to him. They appeared in glory and were speaking of his departure, which he was about to accomplish at Jerusalem.
~Luke 9:28-30
An excerpt from The Dwelling of the Light: Praying with Icons of Christ, by former Archbishop of Canterbury Rowan Williams:
The dark background against which Jesus is shown is something you will see in other icons as a way of representing the depths of heavenly reality. In the transfiguration, what the disciples see is, as you might say, Jesus' humanity 'opening up' to its inner dimensions. It is rather like the Hindu story of the infant Krishna, told by his mother to open his mouth to see if he has been eating mud; she looks in, and sees the whole universe in the dark interior of his throat. So the disciples look at Jesus, and see him as coming out from an immeasurable depth; behind or within him, infinity opens up, 'the dwelling of the light', to borrow the haunting phrase from Job 38.19. Mark 1.38 reports Jesus as saying that he has 'come out' so that he can proclaim the good news; and John's Gospel too uses the language of coming out from the depths of the Father (John 16.27-30). Belief in Jesus is seeing him as the gateway to an endless journey into God's love. The often-noted fact that icons show the lines of perspective reversed, so that they converge on your eye, not on a vanishing point in the distance within the picture, is a way of telling us that, once again, what is true of Jesus lies at the heart of all this style of painting: we are being taught to look through into the deep wells of life and truth.
