7 And they brought the ass and the colt, and laid their garments upon them, and made him sit thereon. 8 And a very great multitude spread their garments in the way: and others cut boughs from the trees, and strewed them in the way:
Jerome: The Apostles’ clothes which are laid upon the beasts may be understood either as the teaching of virtues, or discernment of Scriptures, or verities of ecclesiastical dogmas, with which, unless the soul be furnished and instructed, it deserves not to have the Lord take His seat there.
Remigius: The Lord sitting upon the ass goes towards Jerusalem, because presiding over the Holy Church, or the faithful soul, He both guides it in this life, and after this life leads it to the view of the heavenly country. But the Apostles and other teachers set their garments upon the ass, when they gave to the Gentiles the glory which they had received from Christ.
9 And the multitudes that went before and that followed, cried, saying: Hosanna to the son of David: Blessed is he that cometh in the name of the Lord: Hosanna in the highest.
Remigius: ‘Hosi’ signifies save, ‘anna’ is an interjection used in entreating.
Jerome: It signifies that the coming of Christ is the salvation of the world, whence it follows, “Blessed is he that cometh in the name of the Lord.”
Clearly written of the Saviour’s coming, we read this among other things: “Save me now, O Lord, send now prosperity. Blessed art thou that art to come in the name of the Lord.” [Ps 118:25-26]
Gloss: They repeat, “Hosanna,” that is, “Save, I pray thee,” and define whither they would be saved, in the highest, that is in the heavenly, not in the earthly places.
Hilary: In calling Him the Son of David, they acknowledge His hereditary title to the kingdom.
10 And when he was come into Jerusalem, the whole city was moved, saying: Who is this? 11 And the people said: This is Jesus the prophet, from Nazareth of Galilee.
Jerome: They hail Him as that Prophet whom Moses had said should come like to himself. [Deut 18:15]
Both people, those who before the Gospel, and those who after the Gospel, believed on the Lord, praise Jesus with the harmonious voice of confession.
Scripture from the Douay-Rheims Bible. Commentary from St. Thomas Aquinas, Catena Aurea, Vol. I (London: Rivington, 1842).