Consequently, there is a heavy responsibility on everyone, man or woman, who has the right to vote, especially when the interests of religion are at stake; abstention in this case is in itself, it should be thoroughly understood, a grave and a fatal sin of omission.
--Pope Pius XII, Allocution of Pope Pius XII to the Congress of the International Union of Catholic Women's Leagues, Rome, Italy, September 11, 1947.
