Benedict XIV, Magnae nobis. This is quite worth the read in full. Why? Topic is Catholics marrying. The Pose heard that people mis-understood him. He heard that people thought he had done things contrary to the good of the Church. So, he knew it was his duty to set forth the truth, and he did so:
It was a painful surprise to learn from trustworthy reports and letters that a certain false opinion had spread in Poland. It is said that some matrimonial dispensations had been granted and sent out, indeed, that they are customarily granted and sent out, by this Apostolic See, in which the canonical impediments for a legitimate and valid marriage are removed, even though one or both of the contracting parties openly profess a heretical sect. Since this could only be disseminated by injustice and intolerable calumny, We would be lacking in our Apostolic ministry if We did not clarify the constant rule of action in this matter. At the same time, We earnestly admonish and beseech all of you and your subordinates in Poland, a kingdom renowned for its faith and religion, to read and weigh the letters of matrimonial dispensation which are sent out by the Apostolic See for the people of that kingdom. We are certain that if there ever was any sin in this matter, it was not the fault of this Apostolic See or of its officials; truly it must be attributed entirely to the Ordinaries of places or to their ministers, who did not take care either to read or to weigh sufficiently the letters of dispensation which they received.