35 They should do this the more readily because the Catholic Church, though powerless in any way to abandon the duties of her office or the defence of her authority, still very greatly inclines to kindness and indulgence whenever they are consistent with the safety of her rights and the sanctity of her duties. Wherefore she makes no decrees in relation to marriage without having regard to the state of the body politic and the condition of the general public; and has besides more than once mitigated, as far as possible, the enactments of her own laws when there were just and weighty reasons. Moreover, she is not unaware, and never calls in doubt, that the sacrament of marriage, being instituted for the preservation and increase of the human race, has a necessary relation to circumstances of life which, though connected with marriage, belong to the civil order, and about which the State rightly makes strict inquiry and justly promulgates decrees.
Source: Arcanum Divinae (Vatican.va)