93 Thus far, Venerable Brethren, We have admired with due reverence what the all wise Creator and Redeemer of the human race has ordained with regard to human marriage; at the same time we have expressed Our grief that such a pious ordinance of the divine Goodness should today, and on every side, be frustrated and trampled upon by the passions, errors and vices of men.
Source: Casti Connubii (Vatican.va)