Ambrose of Milan

Now why does He in this place say that they are not to be hindered, who by the imposition of hands can subdue the unclean spirits, when according to Matthew, He says to these, I never knew you? (Matt. 7:23.) But we ought to perceive that there is no difference of opinion, but that the decision is this, that not only the official works but works of virtue are required in a priest, and that the name of Christ is so great, that even to the unholy it serves to give defence, but not grace. Let no one then claim to himself the grace of cleansing a man, because in him the power of the eternal Name has worked. For not by thy merits, but by his own hatred, the devil is conquered.