
Augustine of Hippo
Catena Aurea · Johannesevangelium 10
I am the good shepherd: the good shepherd giveth his life for the sheep. But he that is an hireling, and not the shepherd, whose own the sheep are not, seeth the wolf coming, and leaveth the sheep, and fleeth: and the wolf catcheth them, and scattereth the sheep. The hireling fleeth, because he is an hireling, and careth not for the sheep.
(de Verb. Dom. Serm. xlix) He seeketh therefore in the Church, not God, but something else. If he sought God he would be chaste; for the soul hath but one lawful husband, God. Whoever seeketh from God any thing beside God, seeketh unchastely.