I proceed now to state what appears to have been the ecclesiastical force of the two condemnations by the Roman tribunals—that of the Index prohibiting certain books, and that of the Inquisition punishing Galileo individually, and forcing him to abjure his real or imputed opinions on the Copernican system of astronomy. I trust I shall not lose sight of my position as a lay theologian (in the sense I have defined the term), or trespass upon strictly ecclesiastical preserves; but I may surely say at once, that it is evident no decision was pronounced on any matter of faith. The first case, that of the Index in 1616, I have already discussed; and as for the latter one, that of the Inquisition, it seems hardly credible that any one should maintain that the sentence of a Roman tribunal on an individual, however eminent, could constitute an ex cathedrâ decision on a question of faith. Mr. Roberts, however, seems to maintain something very like this; but he does so by taking some strong, and perhaps extreme, statements made by theologians, such as M. Bouix and Dr. Ward, when writing on some totally different point, and by urging that if these things are true, then Galileo’s condemnation was tantamount to a definition de fide.

I do not feel called upon to answer arguments of this kind. But there is another which is more relevant, drawn from the Brief addressed by Pope Pius IX. to the Archbishop of Munich, about twenty-five years ago, when the congress of philosophers, of whom Dr. Döllinger was the leading spirit, had been held in that city. In that Brief, the Pope states that it is requisite for good Christians to subject themselves in conscience to decisions pertaining to doctrine that are put forth by the Pontifical Congregations; and also to such heads of doctrine as are held to be theological truths by the common consent of Catholics, even when the denial of these does not involve heresy, but deserves some other censure.

Theologians, I believe, are not agreed as to whether this Brief is strictly ex cathedrâ, and therefore to be treated as infallible. But let us assume that it is so. Does the expression, “subject themselves in conscience,” mean necessarily anything more than a respectful acquiescence, as distinguished from a full interior assent? And, allowing that it does even mean this latter, it is for doctrinal decisions that such authority is claimed; and what I am maintaining is, that the decrees in the case of Galileo were purely disciplinary.

I do not of course deny that the line of demarcation between doctrinal and disciplinary is sometimes hard to define. But surely the putting of books on the “Index Librorum Prohibitorum,” whatever be the reasons stated for doing so, is essentially an act of discipline; and so also is the condemnation of any individual man for having disobeyed injunctions laid upon him by authority, or for having disregarded the principles laid down by the same authority for the regulation of its practical conduct, so long as they were in force, and not repealed by any subsequent act.

And this leads me to touch upon another argument of Mr. Roberts, who says, truly enough, that the authority of Rome is greater than that of individual theologians, and that Rome must know her own mind. And because the decision of the Inquisition in 1633, condemning Galileo personally, referred in strong and marked language to the decree of the Index in 1616, therefore he infers that the latter is thereby proved to have been, in the judgment of Rome herself, a doctrinal decision in the strict sense of the words. It is quite true that the Inquisition said that Galileo had done wrong in treating Copernicanism as a probable opinion, since by no means could an opinion be probable that had been declared and defined to be contrary to Holy Scripture; they also said in allusion to the decree of the Index that the books treating of the doctrine had been prohibited, and the doctrine—i.e. Copernicanism—had been declared false and altogether contrary to sacred and Divine Scripture. But a stream cannot rise higher than its source; and the Inquisition itself, having no other powers but those entrusted to it by the Pope, had no authority to put any more stringent interpretation on the decree of 1616 than what it already bore. So far as its actual wording goes, it is palpably a disciplinary decree, though founded on a doctrinal reason; and when the Inquisition cited it as if it were more than this, their language must be interpreted in accordance with the facts of the case; that is, as meaning that for the purposes of discipline, and for all practical intents and purposes, it had been defined that such a theory as that of Copernicus was inadmissible, and on the ground that it was contrary to Scripture as hitherto understood. But a decision of that nature is not irrevocable; it holds good as long as the ecclesiastical authorities determine it should do so, and no longer.

Rome must know her own mind, Mr. Roberts says; and she has shown her own mind, and borne out the construction I am putting on her acts, by further and subsequent action; for, after suspending the prohibitions against Copernicanism—or modifying them—in 1757, a distinct permission was given in 1820 to teach the theory of the Earth’s movement; and again, in 1822, the permission was repeated in a more formal manner, and with the express sanction of the Pope, Leo XII.

Now we know that doctrinal decrees, once fully sanctioned and promulgated by the Holy See, are irreversible; but disciplinary enactments are changed according to the needs of the time and the circumstances of the Christian world.[16] If, then, these decrees against the Copernican theory of astronomy have been practically repealed by a decision no less formal than that which called them originally into existence, it is certain that Rome, who knows her own mind as well after the lapse of two hundred years as after that of seventeen years, considered them as appertaining to the province of discipline and not to that of dogma.

Moreover, Pius IX., when addressing the Archbishop of Munich, must have been well aware of the above-named facts, and when he enunciated the simple rule that good Catholics ought to submit in conscience to the doctrinal decrees of the Roman Congregations—indeed, how can any one imagine the rule to be anything else?—he must in common sense be understood to be speaking of decrees wholly different in scope and character from those relating to the case of Galileo and the system of Copernicus.

It must, nevertheless, be observed that an argument has been adduced by Mr. Roberts, and repeated even by so eminent a writer as Mr. Mivart, as if it were something that threw a new and important light on the subject. It is that Pope Alexander VII., on the 5th March, 1664, published a Bull—known as the Bull “Speculatores”—approving a new and authentic edition of the Index of prohibited books, which Index contained the decree of 1616, and also the monitum of 1620, ordering certain corrections in the work of Copernicus, so that the theory he advocated should be stated merely as a hypothesis—in the preamble of which monitum, however, it is stated that the principles of Copernicus, relating to the movement of the Earth, were contrary to the true and Catholic interpretation of Holy Scripture—and contained also an edict, signed by Bellarmine, prohibiting and condemning Kepler’s work, “Epitome Astronomiæ Copernicanæ;” an edict of August, 1634, prohibiting Galileo’s Dialogue; and in fine, a prohibition of all books teaching the movement of the Earth and the immobility of the Sun.

In the year following this Bull another Index was also published, in which the following words occur, under the head Libri, as being forbidden to the faithful: “Libri omnes, et quicumque libelli, commentarii, compositiones, consulta, epistolæ, glossæ, opuscula, orationes, responsa, tractatus, tam typis editi, quam manuscripti, continentes et tractantes infrascriptas materias, seu de infrascriptis materiis... De mobilitate terræ, et immobilitate Solis.” This, of course, is very sweeping, as it includes all pamphlets and letters, and even writings in manuscript, advocating Copernicanism.