There, before their eyes, he was transfigured. His face shone like the sun, and his clothes became as white as light.
Then the disciples saw Moses and Elijah appear, and they were talking to Jesus.
[...] Let us listen, then, to the sacred voice of God so compellingly calling us from on high, from the summit of the mountain.
So, with the Lord’s chosen disciples, may we penetrate the deep meaning of these holy mysteries, so far beyond our capacity to express.
Jesus goes before us to show us the way, both up the mountain and into heaven….
It is for us now to follow him with all speed, yearning for the heavenly vision that will give us a share in his radiance, renew our spiritual nature and transform us into his own likeness, making us for ever sharers in his Godhead and raising us to heights as yet undreamed of.
Let us run with confidence and joy to enter into the cloud like Moses and Elijah, or like James and John.
Let us be caught up like Peter to behold the divine vision and to be transfigured by that glorious transfiguration.
Let us retire from the world, stand aloof from the earth, rise above the body, detach ourselves from creatures and turn to the creator, to whom Peter in ecstasy exclaimed: Lord, it is good for us to be here.
It is indeed good to be here, as you have said, Peter. It is good to be with Jesus and to remain here for ever.
What greater happiness or higher honor could we have than to be with God, to be made like him and to live in his light?
Therefore, since each of us possesses God in his heart and is being transformed into his divine image, we also should cry out with joy:
It is good for us to be here – here where all things shine with divine radiance, where there is joy and gladness and exultation; where there is nothing in our hearts but peace, serenity and stillness; where God is seen.
For here, in our hearts, Christ takes up his abode together with the Father, saying as he enters: Today salvation has come to this house.
With Christ, our hearts receive all the wealth of his eternal blessings, and there where they are stored up for us in him, we see reflected as in a mirror both the first fruits and the whole of the world to come.
Anastasius of Sinai (7th Century): Sermon on the Feast of the Transfiguration, nn. 6-10, from the Office of Readings for the Feast of the Transfiguration @ Crossroads Initiative.