The Homilies of St. John Chrysostom on the Gospel According to St. Matthew
And when He drew nigh unto Jerusalem, and was come to Bethphage, unto the Mount of Olives, He sent two of His disciples, saying, Go into the village over against you, and ye shall find an ass tied, and a colt with her: loose them, and bring them unto me. And if any man say aught unto you, ye shall say, The Lord hath need of them; and straightway he sendeth them. And this was done, that it might be fulfilled which was spoken by Zechariah the prophet, Tell ye the daughter of Sion, Behold, thy King cometh to thee, meek, and sitting upon an ass, and a colt the foal of an ass. (Matthew 21:1-5)
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.