Pius IX, 1846–1878

1837. So, this gift of truth and a never failing faith was divinely conferred upon Peter and his successors in this chair, that they might administer their high duty for the salvation of all; that the entire flock of Christ, turned away by them from the poisonous food of error, might be nourished on the sustenance of heavenly doctrine, that with the occasion of schism removed the whole Church might be saved as one, and relying on her foundation might stay firm against the gates of hell. 1838. [Definition of infallibility]. But since in this very age, in which the salutary efficacy of the apostolic duty is especially required, not a few are found who disparage its authority, We deem it most necessary to assert solemnly the prerogative which the Only-begotten Son of God deigned to enjoin with the highest pastoral office. 1839. And so We, adhering faithfully to the tradition received from the begin- ning of the Christian faith, to the glory of God, our Savior, the elevation of the Catholic religion and the salvation of Christian peoples, with the approbation of the sacred Council, teach and explain that the dogma has been divinely revealed: that the Roman Pontiff, when he speaks ex cathedra, that is, when carrying out the duty of the pastor and teacher of all Christians in accord with his supreme apostolic authority he ex- plains a doctrine of faith or morals to be held by the universal Church, through the divine assistance promised him in blessed Peter, operates with that infallibility with which the divine Redeemer wished that His Church be instructed in defining doctrine on faith and morals; and so such definitions of the Roman Pontiff from himself, but not from the consensus of the Church, are unalterable. 1840. [Canon]. But if anyone presumes to contradict this definition of Ours, which may God forbid: let him be anathema.

Twofold Power on Earth ¹

[From the Encyclical, “Etsi multa luctuosa,” Nov. 2, 1873]

1841. Faith (however) teaches and human reason demonstrates that a two- fold order of things exists, and that at the same time two powers are to be distinguished on earth, one naturally which looks out for the tran- quillity of human society and secular affairs, but the other, whose origin is above nature, which presides over the city of God, namely, the Church of Christ, divinely established for the peace and the eternal salvation of souls. Moreover, these duties of the twofold power have been very wisely ordained, that “the things that are God’s may be rendered to God,” and, on account of God, “to Caesar the things that are Caesar’s” [Matt. 22:21], who “is great on this account, because he is less than heaven; for he himself