5 Had these things not been abolished I could prove that they ought to be done away by your authority; but since they have been forbidden and prohibited by many princes throughout nearly the whole world, and were abolished at Rome by Gratian of august memory, the brother of your Clemency, in consideration of the true faith, and rendered void by a rescript; do not, I pray you, either pluck up what has been established in accordance with the faith, nor rescind your brother's precepts. In civil matters if he established anything, no one thinks that it ought to be treated lightly, while a precept about religion is trodden under foot.
Source: Letters (New Advent)