John Chrysostom

"Lay hands," he says, "suddenly on no man, neither be partaker of other men's sins." What is "suddenly"? Not upon a first, nor a second, nor a third trial, but after frequent and strict examination and circumspection. For it is an affair of no common peril. For thou wilt be responsible for the sins committed by him, as well his past as his future sins, because thou hast delegated to him this power. For if thou overlook the past unduly, thou art answerable for the future also, as being the cause of them, by placing him in that station, and of the past too, for not leaving him to mourn over them, and to be in compunction. For as thou art a partaker of his good actions, so art thou of his sins.

"Keep thyself pure." This he says with reference to chastity.