36 That this is said with respectful feeling for the Emperor, no one can deny. For what is more full of respect than that the Emperor should be called the son of the Church. As it is said, it is said without sin, since it is said with the divine favour. For the Emperor is within the Church, not above it. For a good emperor seeks the aid of the Church and does not refuse it. As I say this with all humility, so also I state it with firmness. Some threaten us with fire, sword, exile; we have learned as servants of Christ not to fear. To those who have no fear, nothing is ever a serious cause of dread. Thus too is it written: “Arrows of infants their blows have become.”
Source: Sermon against Auxentius (New Advent)