Thomas Mirus discusses Leo XIII's 1880 encyclical Arcanum, on Christian marriage. This was "the first formal and synoptic teaching on marriage since the Council of Trent" – a gap of four centuries. Arcanum is focused on what the Church has done to uplift and protect marriage throughout history. Leo argues at length that the state has no right to usurp the Church's governance of marriage.

LINKS 

Thomas's article on Arcanum https://www.catholicculture.org/commentary/leo-xiii-on-what-marriage-owes-to-church/

Pope Leo XIII, Arcanum https://www.vatican.va/content/leo-xiii/en/encyclicals/documents/hf_l-xiii_enc_10021880_arcanum.html

 Audiobook of Pius XI's Casti Connubii https://www.catholicculture.org/commentary/pope-pius-xi-casti-connubii-on-christian-marriage-full/

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