Fr. Scott A. Haynes
On the Feast of Corpus Christi, we should meditate upon that sacred moment of Holy Communion. As the Priest approaches the communicant to give him Holy Communion, he should endeavor to imagine that his soul is rather like the poor manger of Bethlehem. Like the manger, his soul is rather rough like the straw, but just as that beautiful Babe of Bethlehem ennobled that crude manger to make it His throne, so Our Lord wishes to elevate the soul that devoutly receives Him, so that He might reign over each human heart as His own Kingdom.
Even though our Savior is an Infant wrapped in swaddling clothes, He is, nonetheless, the Shepherd of our souls, just as we are the sheep of His flock. How fitting, therefore, that the faithful come to the communion rail, the altar of the common man, to eat from this holy manger, this feeding trough, not ordinary food, but the Bread come down from Heaven.
Pope Benedict XVI once said:
“Communion only reaches its true depth when it is supported and surrounded by adoration.” 
For this reason, the universal norm in the Church is that we kneel down as we receive Holy Communion:
“The practice of kneeling for Holy Communion has in its favor a centuries-old tradition, and it is a particularly expressive sign of adoration, completely appropriate in light of the true, real and substantial presence of Our Lord Jesus Christ under the consecrated species.” 
The ancient practice of receiving Holy Communion on the tongue recalls the intimate imagery of the nuptial banquet. Holy Communion recalls the Biblical verse from the Book of Canticles in the Old Testament:
“Let Him kiss me with the kiss of His Mouth.” 
Communion is an act of love. Saint Ambrose believed this, for he said:
Osculum mihi Christus infigat! (“May Christ plant a kiss on me!”)