Matthew 21:5

In history, Daughter of Sion is the name given to the city of Jerusalem, which stands on mount Sion. But mystically, it is the Church of the faithful pertaining to the Jerusalem which is above.

Behold, is a word used in pointing out any thing; look, that is, not with the bodily eye, but with the spiritual understanding, at the works of His power. Also aforetimes He oft said, Behold, that He might show that He of whom He spake before He was born was even then thy King. When then ye shall see Him, say not, We have no King but Cæsar. He cometh to thee, (John 19:15.) if thou wilt apprehend Him, that He may save thee; if thou wilt not apprehend Him, He cometh against thee; Meek, so that He is not to be feared for His power, but loved for His meekness; wherefore He sitteth not on a golden car, refulgent in costly purple, nor is mounted on a mettled steed, rejoicing in strife and battle, but upon a she-ass, that loves peace and quiet.

(de Cons. Ev. ii. 66.) In this quotation from the Prophet, there is some variety in the different Gospels. Matthew quotes it as if the Prophet had expressly mentioned the she-ass; but it is not so quoted by John, nor in the Church-copies of the translation in common use. (John 12:15) This seems to me to be accounted for by the account, that Matthew wrote his Gospel in the Hebrew language. And it is clear that the translation called the LXX, has some things different from what are found in the Hebrew, by those who know that tongue, and who have rendered the same books out of the Hebrew. If the reason of this discrepancy be asked, I consider nothing more likely than that the LXX interpreted with the selfsame spirit with which the original was written, which is confirmed by that wonderful agreement among them of which we are told. By thus varying the expression, while they did not depart from the meaning of that God whose words they were, they convey to us the very same thing as we gather from this agreement, with slight variety, among the Evangelists. This shows us that it is no lie, when one relates any thing with such diversities in detail, as that he does not depart from his intention with whom he ought to agree. To know this is useful in morals in avoiding lies; and for faith itself, that we should not suppose that the truth is secured in sacred sounds, as though God imparted to us not the matter only, but the words in which the matter is conveyed. Rather the matter is in such sort conveyed in words, that we ought not to want words at all, if it were possible that the matter could be known by us without words, as God and His Angels know it. It follows, But the disciples went and did as Jesus commanded them, and brought the ass, and the colt. The other Evangelists say nothing of the ass. And if Matthew had not mentioned the colt, as they do not mention the ass, the reader ought not to have been surprised. How much less then should it move him, when one has so mentioned the ass which the others have omitted, as not to forget the colt which they have mentioned. For there is no discrepancy where both circumstances may have occurred, though one only related one, and another another; how much less then where one mentions both, though another mentions only one? It follows, And they put on them their clothes, and set him thereon.