Cardinal Gibbons explained papal infallibility like this

Taken from the book Faith of Our Fathers by James Cardinal Gibbons, published 1917, here.

Coat of arms of Alexander VII in St. Peters square, Mike Steele, CC-BY 2.0, 2016, https://www.flickr.com/photos/21022123@N04/26782708582/

Image by Mike Steele from 2016, CC-BY 2.0 on Flickr


But you will tell me that infallibility is too great a prerogative to be conferred on man. I answer: Has not God, in former times, clothed His Apostles with powers far more exalted? They were endowed with the gifts of working miracles, of prophecy and inspiration; they were the mouth-piece communicating God’s revelation, of which the Popes are merely the custodians. If God could make man the organ of His revealed Word, is it impossible for Him to make man its infallible guardian and interpreter? For, surely, greater is the Apostle who gives us the inspired Word than the Pope who preserves it from error.

If, indeed, our Saviour had visibly remained among us, no interpreter would be needed, since He would explain His Gospel to us; but as He withdrew His visible presence from us, it was eminently reasonable that He should designate someone to expound for us the meaning of His Word.

A Protestant Bishop, in the course of a sermon against Papal Infallibility, recently used the following language: “For my part, I have an infallible Bible, and this is the only infallibility that I require.” This assertion, though plausible at first sight, cannot for a moment stand the test of sound criticism.

Let us see, sir, whether an infallible Bible is sufficient for you. Either you are infallibly certain that your interpretation of the Bible is correct or you are not.

If you are infallibly certain, then you assert for yourself, and of course for every reader of the Scripture, a personal infallibility which you deny to the Pope, and which we claim only for him. You make every man his own Pope.

If you are not infallibly certain that you understand the true meaning of the whole Bible—and this is a privilege you do not claim—then, I ask, of what use to you is the objective infallibility of the Bible without an infallible interpreter?

If God, as you assert, has left no infallible interpreter of His Word, do you not virtually accuse Him of acting unreasonably? for would it not be most unreasonable in Him to have revealed His truth to man without leaving him a means of ascertaining its precise import?

Do you not reduce God’s word to a bundle of contradictions, like the leaves of the Sybil, which gave forth answers suited to the wishes of every inquirer?

Of the hundred and more Christian sects now existing in this country, does not each take the Bible as its standard of authority, and does not each member draw from it a meaning different from that of his neighbor? Now, in the mind of God the Scriptures can have but one meaning. Is not this variety of interpretations the bitter fruit of your principle: “An infallible Bible is enough for me,” and does it not proclaim the absolute necessity of some authorized and unerring interpreter? You tell me to drink of the water of life; but of what use is this water to my parched lips, since you acknowledge that it may be poisoned in passing through the medium of your interpretation?

How satisfactory, on the contrary, and how reasonable is the Catholic teaching on this subject!

According to that system, Christ says to every Christian: Here, my child, is the Word of God, and with it I leave you an infallible interpreter, who will expound for you its hidden meaning and make clear all its difficulties.

Here are the waters of eternal life, but I have created a channel that will communicate these waters to you in all their sweetness without sediment of error.

Here is the written Constitution of My Church. But I have appointed over it a Supreme Tribunal, in the person of one “to whom I have given the keys of the Kingdom of Heaven,” who will preserve that Constitution inviolate, and will not permit it to be torn into shreds by the conflicting opinions of men. And thus my children will be one, as I and the Father are one.