33 It must consequently be acknowledged that the Church has deserved exceedingly well of all nations by her ever watchful care in guarding the sanctity and the indissolubility of marriage. Again, no small amount of gratitude is owing to her for having, during the last hundred years, openly denounced the wicked laws which have grievously offended on this particular subject; (51) as well as for her having branded with anathema the baneful heresy obtaining among Protestants touching divorce and separation;(52) also, for having in many ways condemned the habitual dissolution of marriage among the Greeks;(53) for having declared invalid all marriages contracted upon the understanding that they may be at some future time dissolved;(54) and, lastly, for having, from the earliest times, repudiated the imperial laws which disastrously favored divorce.(55)
Source: Arcanum Divinae (Vatican.va)