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.
(Tr. xlvi. 8) Lo, the wolf hath seized a sheep by the throat, the devil hath enticed a man into adultery. The sinner must be excommunicated. But if he is excommunicated, he will be an enemy, he will plot, he will do as much harm as he can. Wherefore thou art silent, thou dost not censure, thou hast seen the wolf coming, and fled. Thy body has stood, thy mind has fled. For as joy is relaxation, sorrow contraction, desire a reaching forward of the mind; so fear is the flight of the mind.