John Chrysostom — as excerpted in the Catena Aurea on John 20:19-25

“(Hom. lxxxvi. 4) A priest though he may have ordered well his own life, yet, if he have not exercised proper vigilance over others, is sent to hell with the evil doers. Wherefore, knowing the greatness of their danger, pay them all respect, even though they be not men of notable goodness. For they who are in rule, should not be judged by those who are under them. And their incorrectness of life will not at all invalidate what they do by commission from God. For not only cannot a priest, but not even angel or archangel, do any thing of themselves; the Father, Son, and Holy Ghost do all. The priest only furnishes the tongue, and the hand. For it were not just that the salvation of those who come to the Sacraments in faith, should be endangered by another’s wickedness. (Hom. lxxxvii. 1). At the assembly of the disciples all were present but Thomas, who probably had not returned from the dispersion: But Thomas, one of the twelve, called Didymus, was not with them when Jesus came.”