Pius IX, 1846-1878

of philosophizing which, even if it admits divine revelation as an historical fact, nevertheless, submits the ineffable truths made known by divine revelation to the investigations of human reason; just as if those truths had been subject to reason, or, as if reason, by its own powers and principles, could attain understanding and knowledge of all the supernal truths and mysteries of our holy faith, which are so far above human reason that it can never be made fit to understand or demonstrate them by its own powers, and on its own natural principles [see n. 1709]. Indeed, We honor with due praise the men of this same convention because, rejecting, as We think, the false distinction between philosopher and philosophy, about which We have spoken in our other letter to you [see n. 1674], they have realized and professed that all Catholics in their learned interpretations should in conscience obey the dogmatic decrees of the infallible Catholic Church.

1683. While, in truth, We laud these men with due praise because they professed the truth which necessarily arises from their obligation to the Catholic faith, We wish to persuade Ourselves that they did not wish to confine the obligation, by which Catholic teachers and writers are absolutely bound, only to those decrees which are set forth by the infallible judgment of the Church as dogmas of faith to be believed by all [see n. 1722]. And We persuade Ourselves, also, that they did not wish to declare that that perfect adhesion to revealed truths, which they recognized as absolutely necessary to attain true progress in the sciences and to refute errors, could be obtained if faith and obedience were given only to the dogmas expressly defined by the Church. For, even if it were a matter concerning that subjection which is to be manifested by an act of divine faith, nevertheless, it would not have to be limited to those matters which have been defined by express decrees of the ecumenical Councils, or of the Roman Pontiffs and of this See, but would have to be extended also to those matters which are handed down as divinely revealed by the ordinary teaching power of the whole Church spread throughout the world, and therefore, by universal and common consent are held by Catholic theologians to belong to faith.

1684. But, since it is a matter of that subjection by which in conscience all those Catholics are bound who work in the speculative sciences, in order that they may bring new advantages to the Church by their writings, on that account, then, the men of that same convention should recognize that it is not sufficient for learned Catholics to accept and revere the aforesaid dogmas of the Church, but that it is also necessary to subject themselves to the decisions pertaining to doctrine which are issued by the Pontifical Congregations, and also to those forms of doctrine which are held by the common and constant consent of Catholics as theological