"A third consequence: Sterilization is no longer seen as a mutilating encroach-ment on human dignity and divine providence, but as a radical and definitive contracep-tive method. According to research by the Family Planning Service in England, the number of sterilized couples rose from 4 percent in 1970 to 24 percent in 1983. It is anticipated this percentage will rise to 33 in 1995. Pope Paul VI pointed out that contraception is a dangerous weapon in the hands of government. How many governments in the Third World promote contraceptives or advance sterilization to solve their demographic problems? The rich countries encourage them, driven by thinly disguised imperialism. Who could blame a government for applying, as a solution to the problems of the community, those means acknowledged to be permissible for married couples in solving a family problem (Humane Vitae No. 17)?"
January 1, 1970
https://en.wikiquote.org/wiki/Christian_views_on_birth_control