12 But when a reason for exercising my office arose, I both wrote and petitioned for those who were in anxiety about themselves, that I might show that in the canse of God I felt a righteous fear, and that I did not value flattery above my own soul; but in those matters in which it is fitting that petitions should be addressed to you. I also pay the deference due to authority, as it is written: “Honour to whom honour is due, tribute to whom tribute.” For since I deferred from the bottom of my heart to a private person, how could I not defer to the Emperor? But do you who desire that deference be paid to you suffer us to pay deference to Him Whom you are desirous to be proved the Author of your power.
Source: Letters (New Advent)