"The widespread use of contraception unavoidably and inexorably results in a number of cata-strophic social consequences. Marital oneness, propagation and the very meaning of love are divorced from the marital act when contraceptives are injected into a relationship. The underlying roles of man and society are thereby jeopardized. We therefore can see the great wisdom of the Catholic Church in upholding the moral law from which no human activity is excluded - not even science. Science is not neutral. Properly used, it must serve the welfare of the people and respect their dignity. Contraception is not a private matter without moral repercussions for society at large. As we have seen, widespread contraceptive use thoroughly impacts the very foundations of the culture that embraces it. Enlightened by the teaching of the Church, we believe that man can come again to a practice of birth regulation that respects human dignity and the sacred character of marriage and of life."
January 1, 1970
https://en.wikiquote.org/wiki/Christian_views_on_birth_control