Saint Cyril on Separating the Sheep from the Goats

Does not the wool show the sheep, and the hairy and rough skin the goat? In like manner, if thou hast been just now cleansed from thy sins, thy deeds shall be henceforth as pure wool; and thy robe shall remain unstained, and thou shall ever say, I have put off my coat, how shall I put it on? By thy vesture shall thou be known for a sheep. But if thou be found hairy, like Esau, who was rough with hair, and wicked in mind, who for food lost his birthright and sold his privilege, thou shall be one of those on the left hand.

— Saint Cyril of Alexandria, Lecture 15:25