45 You will at once see, venerable brothers, that the doctrine and precepts in relation to Christian marriage, which We have thought good to communicate to you in this letter, tend no less to the preservation of civil society than to the everlasting salvation of souls. May God grant that, by reason of their gravity and importance, minds may everywhere be found docile and ready to obey them! For this end let us all suppliantly, with humble prayer, implore the help of the Blessed and Immaculate Virgin Mary, that, our hearts being quickened to the obedience of faith, she may show herself our mother and our helper. With equal earnestness let us ask the princes of the Apostles, Peter and Paul, the destroyers of heresies, the sowers of the seed of truth, to save the human race by their powerful patronage from the deluge of errors that is surging afresh. In the meantime, as an earnest of heavenly gifts, and a testimony of Our special benevolence, We grant to you all, venerable brothers, and to the people confided to your charge, from the depths of Our heart, the apostolic benediction. Given at St. Peter's in Rome, the tenth day of February, 1880, the third year of Our pontificate.
Source: Arcanum Divinae (Vatican.va)