Matthew 17:2

And was transfigured before them: and his face did shine as the sun, and his clothing was white as the light.
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Augustine of Hippo

AD 430
Indeed, Jesus himself shone as the sun, indicating that he is the light which illuminates every one who comes into this world. And this is the sun to the eyes of the flesh, that is the sun to the eyes of the heart. His garments are a type of his church. For garments, unless held up by the one having donned them, fall. Paul was like the lowest hem of these garments. For he himself says, “For I am the least of the apostles,” and in another passage, “I am the last of the apostles.” On a garment, the hem is the last thing and the least. Just as that woman who touched the Lord’s hem was made well, so the church which came out of the Gentiles was saved by means of Paul’s preaching.

George Leo Haydock

AD 1849
Transfigured. Let no one think that he changed his natural form, laying aside his corporeal, and assuming a spiritual form; but when the evangelist says his countenance shone like the sun, and describes the whiteness of his garments, he shows in what the transfiguration consisted. He added to his former appearance splendour and glory, but laid not aside his substance. The Lord was transfigured into that glory with which he will appear again at the day of judgment, and in his kingdom. (St. Jerome) Calvin translates metamorphous Thai, transformed, but contrary to the sentiment of the holy fathers. He did not show them his divinity, which cannot be seen by the eyes of the body, but a certain glimpse or sign of the same: hence the hymn: Quicunque Christum quæritis, Oculos in altum tollite; Illìc lice bit visere Signum perennis gloriæ.

Jerome

AD 420
Certainly the Lord was transformed into that glory with which he would afterwards come in his own kingdom. The change accentuated in splendor. It did not diminish his outward appearance. Let it be that his body had become spiritual. Even his garments were changed, which were white to such a high degree that as another Evangelist would say, “And his clothes became dazzling white, as no fuller on earth could bleach them.” What the mortal bleacher on earth is able to make is material and subject to touch, not supernatural and heavenly, which mocks the eyes and is only seen in a vision. .

John Chrysostom

AD 407
Wherefore does He take with Him these only? Because these were superior to the rest. And Peter indeed showed his superiority by exceedingly loving Him; but John by being exceedingly loved of Him; and James again by his answer which he answered with his brother, saying, We are able to drink the cup; nor yet by his answer only, but also by his works; both by the rest of them, and by fulfilling, what he said. For so earnest was he, and grievous to the Jews, that Herod himself supposed that he had bestowed herein a very great favor on the Jews, I mean in slaying him. But wherefore does He not lead them up straightway? To spare the other disciples any feeling of human weakness: for which cause He omits also the names of them that are to go up. And this, because the rest would have desired exceedingly to have followed, being to see a pattern of that glory; and would have been pained, as overlooked. For though it was somewhat in a corporeal way that He made the disclosure, yet nevertheless...

Theophylact of Ochrid

AD 1107
He brings them up onto a high mountain, showing that unless a man is raised up high, he does not become worthy of such divine visions. A mountain set "apart," because Christ would often perform the most wondrous of His miracles in secret, lest the multitude see Him as God and think that He was human in appearance only. When you hear "He was transfigured," do not think that He had cast off His body at that moment, for His body remained in its own form, as you hear mention of His face and His clothing. But it appeared more resplendent, the divine exhibiting in small part its effulgence as much as they were able to see. This is why He had also previously spoken of the Transfiguration as "the kingdom" of God (Mt 16:28), for it exhibited the indescribable majesty of His power, it showed that He is the true Son of the Father, and it had the aspect of the second coming on account of the ineffable radiance of Jesus’ face.

Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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