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 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 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 IXThese enemies of divine revelation extol human progress to the skies, and with rash and sacrilegious daring would have it introduced into the Catholic religion as if this religion were not the work of God but of man, or some kind of philosophical discovery susceptible of perfection by human efforts.
Pope Pius IX