Augustine of Hippo
Catena Aurea · Lukasevangelium 18
And when Jesus saw that he was very sorrowful, he said, How hardly shall they that have riches enter into the kingdom of God! For it is easier for a camel to go through a needle’s eye, than for a rich man to enter into the kingdom of God. And they that heard it said, Who then can be saved? And he said, The things which are impossible with men are possible with God. Then Peter said, Lo, we have left all, and followed thee. And he said unto them, Verily I say unto you, There is no man that hath left house, or parents, or brethren, or wife, or children, for the kingdom of God’s sake, Who shall not receive manifold more in this present time, and in the world to come life everlasting.
(de Quæst Evang. lib. ii. c. 42.) The name of “rich” he here gives to one who covets temporal things, and boasts himself in them. To such rich men are opposed the poor in spirit, of whom is the kingdom of heaven. Now mystically it is easier for Christ to suffer for the lovers of this world, than for the lovers of this world to be converted to Christ. For by the name of a camel He would represent Himself: for He voluntarily humbled Himself to bear the burdens of our infirmity. By the needle He signifies sharp piercings, and thereby the pangs received in His Passion, but by the form of the needle He describes the straitening of the Passion.