4 We, then, also have One Whom it is even more perilous to displease, especially since even emperors are not displeased when every one discharges his own office, and you patiently listen to every one making suggestions in his own sphere, nay, you rebuke him if he act not according to the order of his service. Can this, then, seem to you offensive in priests, which you willingly accept from those who serve you; since we speak not what we wish, but what we are bidden? For you know the passage: “When you shall stand before kings and rulers, take no thought what you shall speak, for it shall be given you in that hour what you shall speak; for it is not you that speak, but the Spirit of your Father Who speaks in you.” And if I were speaking in state causes, although justice must be observed even in them, I should not feel such dread if I were not listened to, but in the cause of God whom will you listen to, if not to the priest, at whose greater peril sin is committed? Who will dare to tell you the truth if the priest dare not?
Source: Letters (New Advent)