On Birth Control and Overpopulation

The Church's stand on birth control is the most absolutely spiritual of all her stands and with all of us being materialists at heart, there is little wonder that it causes unease. I wish various fathers would quit trying to defend it by saying that the world can support 40 billion. I will rejoice in the day when they say: This is right, whether we all rot on top of each other or not, dear children, as we certainly may. Either practice restraint or be prepared for crowding ...
(Habit of Being: Letters of Flannery O'Connor, "To 'A'," 27 June 1959.)