Blessed feast to everyone!
Remember, the same Lord who showed forth His glory in a brief moment to Peter, James, and John on the mountain is also He Who veils Himself under the appearance of bread for love of us.
The post-communion from the Mass of the Transfiguration sums it up.
“Præsta, quǽsumus, omnípotens Deus: ut sacrosáncta Fílii tui Transfiguratiónis mystéria, quæ sollemni celebrámus offício, purificáta mentis intellegéntia consequámur.”
“Grant, we beseech Thee, almighty God, that by the understanding of our minds made pure, we may grasp the mystery of the Transfiguration of Thine only-begotten Son, which we celebrate by these solemn rites.”
Harvey Millican's Blog: Musings of a Trad Dad 