One day Jesus took Peter, James and John to a high mountain and was transfigured before them. His face became as bright as the sun and his clothes white as light. (Mt 17:1-2) The light was a revelation of his divinity which the apostles perceived as light. The vision was so luminous, peaceful and enchanting capturing a moment of eternity so that they desired to stay in his presence forever.

Joyful, Joyful, We Adore Thee
Joyful, joyful, we adore thee,
God of glory, Lord of love;
hearts unfold like flowers before thee,
opening to the sun above.
Melt the clouds of sin and sadness;
drive the dark of doubt away.
Giver of immortal gladness,
fill us with the light of day!

As they were gazing, Moses and Elijah appeared conversing with Jesus. Moses was the instrument chosen by God to lead the Jews to the worship and love the true God and we read in (2 kgs 2:11) that Elijah was taken up into heaven in a flaming chariot.

Than a bright cloud overshadowed them and a voice said, "This is my beloved Son, with whom I am well please; listen to him." This was the Father's voice confirming the divinity of Christ. When the apostle heard the voice they became very afraid and fell prostrate to the ground. The realization came upon them that they stood in the presence of the Tremendous mystery of God.

Let All Mortal Flesh Keep Silence

Let all mortal flesh keep silence,
and with fear and trembling stand;
ponder nothing earthly-minded,
for with blessing in his hand,
Christ our God to earth descendeth,
our full homage to demand.

Cloud and light are manifestations of the Holy Spirit. The cloud first appeared to the Israelites during their flight from Egypt - at times luminous and obscure, it revealed to the Israelites both the presence of the living and saving God while veiling the transcendence of his glory. (Cath. of Catholic Church, No.697)

The transfiguration of Christ is a foretaste of the Resurrection and of our transfiguration in glory as as is written,

"Then the righteours will shine like the sun
in the kingdom of their Father."
(Mt 13:43)

Faith Transfigures Art