Let us pray for graces to go up the mountain to see the sanctifying light shining from Jesus!
We sing this verse of the hymn at ad Laudes:
Quam lætus est, quem vísitas!
Consors Paternæ déxteræ,
Tu dulce lumen pátriæ,
Carnis negatum sénsibus.
Joyous is he, with whom,
God’s Word, thou dost abide;
Sweet light of our eternal home,
To fleshly sense denied
This feast has a history. It was placed on the Roman Calendar by Pope Callixtus III to celebrate a victory of Christian crusaders against Turkish Muslims in 1456. Here is a link to a short video: