Immaculate Conception of Our Lady December 8th Lesson vi

In answer to the petitions of the whole Church, Pope Pius IX decided solemnly to proclaim by his supreme and infallible pronouncement the victory of the Virgin Mother of God in her Conception over the dreadful enemy of the human race -- a doctrine wonderfully set forth in Holy Scripture, in the venerable tradition of the continuing consensus of the Church, as also in the common agreement of all bishops and faithful, and in the outstanding acts and constitutions of the Holy See. And therefore, on December 8th, 1854, in the Vatican Basilica, in the presence of a vast assembly of the Fathers of the Roman Church, including cardinals and bishops from the most distant countries, and with the applause of the whole world, he solemnly declared and defined: The doctrine which holds that the most blessed Virgin Mary, at the first instant of her conception, by a singular privilege granted her by God, was preserved from any stain of original sin, is a doctrine taught and revealed by God, and is therefore to be believed with firmness and constancy by all the faithful.