9 Then afterwards, when he had undertaken the episcopate, not obtained by solicitation nor by extortion, but by the will of God who makes priests; what a virtue there was in the very undertaking of his episcopate, what strength of mind, what firmness of faith—a thing that we ought with simple heart both thoroughly to look into and to praise—that he intrepidly sate at Rome in the sacerdotal chair at that time when a tyrant, odious to God's priests, was threatening things that can, and cannot be spoken, inasmuch as he would much more patiently and tolerantly hear that a rival prince was raised up against himself than that a priest of God was established at Rome.
Is not this man, dearest brother, to be commended with the highest testimony of virtue and faith? Is not he to be esteemed among the glorious confessors and martyrs, who for so long a time sate awaiting the manglers of his body and the avengers of a ferocious tyrant, who, when Cornelius resisted their deadly edicts, and trampled on their threats and sufferings and tortures by the vigour of his faith, would either rush upon him with the sword, or crucify him, or scorch him with fire, or rend his bowels and his limbs with some unheard-of kind of punishment?
Even though the majesty and goodness of the protecting Lord guarded, when made, the priest whom He willed to be made; yet Cornelius, in what pertains to his devotion and fear, suffered whatever he could suffer, and conquered the tyrant first of all by his priestly office, who was afterwards conquered in arms and in war.
Source: The Epistles of Cyprian (New Advent)