This is propagandistic nonsense. One 19th-century Catholic priest (I presume he was a priest, since the permanent diaconate did not exist at that time), in the precise year when papal infallibility was defined, publishes a book making a dubious historical argument, so of course White (notorious among scholars today for distorting and poisoning the entire subject with his seriously misleading “warfare” metaphor) lauds him as “honest” and refers to him “confessing” what he may well have been happy to argue. Plenty of Catholics, including in particular many English Catholics, opposed papal infallibility. The “Rev. Mr. Roberts” is not himself infallible, and it’s quite likely that the book was written before the actual decree on infallibility was promulgated. This is a worthless piece of evidence. You need to consider your sources more seriously.
Edwin
My understanding is that Roberts was an Anglican, not a Catholic. So his misunderstanding of papal infallibility is perhaps more understandable, but no less incorrect.
With regard to the citation from Alexander VII above (citing the Wikipedia article) the whole point as spelled out in that article is that his action was simply to maintain those works on the Index of Forbidden Books, which has never been understood by anybody to represent a definition of any doctrine
ex cathedra. It has always been understood that the Index is a matter of discipline, which is demonstrated by the fact that it was repeatedly revised and ultimately done away with altogether. Even the works of Sister St. Faustina were at one time on the Index. It’s a matter of pastoral prudence, not infallible dogma.
And as for Roberts’s contention that earlier actions (as in 1616 and 1633) were infallible decrees, it’s just nonsense since in neither case was anything promulgated personally by the Pope directly on his authority. As I have said in my recent series against neo-geocentrism, the seventeenth century Popes knew perfectly well how to promulgate some matter as an article of faith for the whole Catholic Church. But on geocentrism they never did so.
Again, the Protestant scholar Karl von Gebler:
The conditions which would have made the decree of the Congregation, or the sentence against Galileo, of dogmatic importance, were, as we have seen, wholly wanting. Both Popes had been too cautious to endanger this highest privilege of the papacy by involving their infallible authority in the decision of a scientific controversy; they therefore refrained from conferring their sanction, as heads of the Roman Catholic Church, on the measures taken, at their instigation, by the Congregation “to suppress the doctrine of the revolution of the earth.” Thanks to this sagacious foresight, Roman Catholic posterity can say to this day, that Paul V. and Urban VIII. sere in error “as men” about the Copernican system, but not “as Popes.” (Karl von Gebler, Galileo Galilei and the Roman Curia, trans. J. Sturge, London: C. Kegan Paul & Co., 1879, pp. 235-6, 239)