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

Liberal Catholics are the worst enemies of the Church.

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

In fact, there is only one true and holy religion, founded and instituted by Christ Our Lord. Mother and Nurse of the virtues, Destroyer of vice, Liberator of souls, Guide to true happiness, she is called Catholic, Apostolic, and Roman.

It is error to believe that Every man is free to embrace and profess that religion which, guided by the light of reason, he shall consider true.

I have always condemned Liberal Catholicism and I will condemn it again forty times over if it be necessary.

If anyone says that it is possible that at some time, given the advancement of knowledge, a sense may be assigned to the dogmas propounded by the Church which is different from that which the Church has understood and understands: let him be anathema.