Nothing can ever pass away from the words of Christ, nor can anything be changed in the doctrine which the Catholic Church received from Christ to guard, protect, and preach.
Pope Pius IXNeither the true faith nor eternal salvation is to be found outside the Holy Catholic Church.
Pope Pius IXIt 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.
Pope Pius IXSocialism, Communism, clandestine societies, Bible societies... pests of this sort must be destroyed by all means.
Pope Pius IXThe state (the U.S. Constitution) has not the right to leave every man free to profess and embrace whatever religion he may desire.
Pope Pius IXThe civil liberty of every mode of worship, and full power given to all of openly and publicly manifesting their opinions and their ideas conduce more easily to corrupt the morals and minds of the people... The Roman Pontiff cannot and ought not to reconcile himself or agree with, progress, liberalism and modern civilization.
Pope Pius IX