Remigius of Auxerre — as excerpted in the Catena Aurea on Matthew 21:1-9

“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. The multitudes spread their garments in the way, when they of the circumcision who believed, despised the glory which they had by the Law. They cut down branches from the trees, because out of the Prophets they had heard of the green Branch as an emblem of Christ. (Is. 11:1. Jer. 23:5.) Or, the multitudes who spread their garments in the way, are the martyrs who gave to martyrdom for Christ their bodies, which are the clothing of their minds. Or, they are signified, who subdue their bodies by abstinence. They who cut down the branches of the trees, are they who seek out the sayings and examples of the holy fathers for their own or their children’s salvation.”