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: