Here is the Collect for Wednesday of the 1st Week of Advent.
Praepara, quaesumus, Domine Deus noster,
corda nostra divina tua virtute,
ut, veniente Christo Filio tuo,
digni inveniamur aeternae vitae convivio,
et cibum caelestem, ipso ministrante, percipere mereamur.
This prayer was in the ancient Gelasian Sacramentary.
Ministro is "to attend, wait upon, serve, esp. at table, to serve up, pour out, hand food or drink". Percipio is to "to take possession of, to seize, occupy" but also "to learn, know, conceive, comprehend, understand, perceive".
O Lord our God, we beseech You, prepare
our hearts by means of Your divine power,
so that, as Christ Your Son is coming,
we may be found worthy of the banquet of heavenly life,
and, He Himself acting as the servant, we may merit to receive the celestial food.
What is really interesting here is the image of Christ as the "minister" of the heavenly Communion. Remember what the Lord said about the master of the house who goes away and, on his return, finds the servants ready to let him in when he knocks even if it is at a very inconvenient hour? Jesus says that in the master of the house himself will serve the servants. The Pope has used also the referene to the Lord knocking on the door. Fascinating.
Also, in the verb percipio we have the idea of "perceiving" with the faculties of reason what is going on. In heaven we will moe from faith to understanding. There will be amazing moments of realization in heaven. Never ending opportunities of discovery and amazment before the Beatific Vision. What food for the soul! But since we are living in a state of "already but not yet", this can also refer to what will happen in this very Mass later on after reading of Scripture (in which the Lord comes) and the consecration (in which the Lord comes) and in Communion when the alter Christus gives Him to us as we kneel in wonder and gratitude.