Neither the true faith nor eternal salvation is to be found outside the Holy Catholic Church.

Socialism, Communism, clandestine societies, Bible societies... pests of this sort must be destroyed by all means.

The state (the U.S. Constitution) has not the right to leave every man free to profess and embrace whatever religion he may desire.

The Church is built on the rock of Peter, and he who eats the Lamb outside this holy dwelling is reprobate .. .He who eats the Lamb outside this Apostolic See has no part with God!

The most Blessed Virgin Mary, in the first instant of her conception, by a singular grace and privilege granted by almighty God, in view of the merits of Jesus Christ, the savior of the human race, was preserved free from all stain of original sin.

Liberal Catholics are the worst enemies of the Church.

Atheism in legislation, indifference in matters of religion, and the pernicious maxims which go under the name of Liberal Catholicism are the true causes of the destruction of states; they have been the ruin of France. Believe me, the evil I denounce is more terrible than the Revolution, more terrible even than The Commune. I have always condemned Liberal Catholicism, and I will condemn it again forty times over if it be necessary.