17 Shall I not value the father of Gratian more than my very eyes? Your other holy pledges also claim pardon. I conferred beforehand a dear name on those to whom I bore a common love. I follow you with my love, my affection, and my prayers. If you believe me, be guided by me; if, I say, you believe me, acknowledge what I say; if you believe me not, pardon that which I do, in that I set God before you. May you, most august Emperor, with your holy offspring, enjoy perpetual peace with perfect happiness and prosperity.
Source: Letters (New Advent)