Matthew 21:7

Never before had the Lord employed the services of beasts, nor surrounded Himself with the ornaments of green boughs, till now when He is going up to Jerusalem to suffer. He moved them that beheld to do that which they had before desired to do; so it was opportunity that was now given them, not their purpose that was changed.

Notwithstanding, it was possible that the Lord might have sate upon both animals. 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.

Whence Matthew, who wrote his Gospel to the Jews, is the only one who mentions that the ass was brought to the Lord, to show that this same Hebrew nation, if it repent, need not despair of salvation,

And yet He had often entered Jerusalem before, but never with so much circumstance. What then is the cause? It was the beginning then of the dispensation; and neither was He very well known, nor the time of His passion near; wherefore He mixed with them with less distinction, and more disguising Himself. For He would not have been held in admiration, had He so appeared, and He would have excited them to greater anger. But when He had both given them sufficient proof of His power, and the cross was at the doors, He makes Himself then more conspicuous, and doeth with greater circumstance all the things that were likely to inflame them. For it was indeed possible for this to have been done at the beginning also; but it was not profitable nor expedient it should be so. But do thou observe, I pray thee, how many miracles are done, and how many prophecies are fulfilled. He said, "Ye shall find an ass;" He foretold that no man should hinder them, but that all, when they heard, should hold their peace. But this is no small condemnation of the Jews, if them that were never known to Him, neither had appeared before Him, He persuades to give up their own property, and to say nothing against it, and that by His disciples, while these, being present with Him at the working of His miracles, were not persuaded.

And do not account what was done to be a small thing. For who persuaded them, when their own property was taken from them, and that, when they were perhaps poor men and husbandmen, not to forbid it? Why say I not to forbid it? not to ask, or even if they asked, to hold their peace, and give it up. For indeed both things were alike marvellous, as well, if they said nothing, when their beasts were dragged away, or if having spoken, and heard, "The Lord hath need of them," they yielded and withstood not, and this when they see not Him, but His disciples. By these things He teaches them, that it was in His power to have entirely hindered the Jews also, even against their will, when they were proceeding to attack Him, and to have made them speechless, but He would not. And another thing again together with these doth He teach the disciples, to give whatever He should ask; and, though he should require them to yield up their very life, to give even this, and not to gainsay. For if even strangers gave up to Him, much more ought they to strip themselves of all things. And besides what we have said, He was fulfilling also another prophecy, one which was twofold, one part in words, and another in deeds. And that in deeds was, by the sitting on the ass; and that by words, the prediction of Zacharias; because he had said, that the King should sit on an ass. And He, having sat and having fulfilled it, gave to the prophecy another beginning again, by what He was doing typifying beforehand the things to come. How and in what manner? He proclaimed beforehand the calling of the unclean Gentiles, and that He should rest upon them, and that they should yield to Him and follow Him, and prophecy succeeded to prophecy. But to me He seemeth not for this object only to sit on the ass, but also as affording us a standard of self-denial. For not only did He fulfill prophecies, nor did He only plant the doctrines of the truth, but by these very things He was correcting our practice for us, everywhere setting us rules of necessary use, and by all means amending our life.