Augustine of Hippo — as excerpted in the Catena Aurea on John 10:1-5

“(de Verb. Dom. Serm. xlix) He enters by the door, who enters by Christ, who imitates the suffering of Christ, who is acquainted with the humility of Christ, so as to feel and know, that if God became man for us, man should not think himself God, but man. He who being man wishes to appear God, does not imitate Him, who being God, became man. Thou art bid to think less of thyself than thou art, but to know what thou art.”