"In [true]] marital union, husband and wife are meant to experience the vibration of human vitality in its very source. In the case of contraceptive "union", the spouses experience sensation, but it is drained of real vitality. The anti-life effect of contraception does not stop at the "No" which it addresses to the possible fruit of love. It tends to take the very life out of love itself. Within the hard logic of contraception, anti-life becomes anti-love. Its devitalizing effect devastates love, threatening it with early ageing and premature death."
January 1, 1970
https://en.wikiquote.org/wiki/Christian_views_on_birth_control