Melchisedech, king of righteousness, who is at the very gates says,
“When the LORD established the heavens, I was there.”
He was there
when the morning stars sang together,
and all the sons of God [- he one of them -] shouted for joy
Cf Job 38:6-7 (RSVCE)
Though pre-existing the day-star.
From the womb, before the day-star have I begotten thee.
The LORD hath sworn, and will not repent: Thou art a priest for ever according to the order of Melchisedech.
– Psalm cix, Vespers, Little Office of BVM
Because they will live to see the fulfillment of the above-named Psalm:
Thine shall be the dominion in the day of thy power, amid the brightness of the saints: from the womb […]
The revelation of these sons of God among us very close. Apparently they are beings of light, like Moses glowed after speaking with God on the Mountain.