God alone is infallible of His very nature. But God can certainly safeguard a particular man so that he will be also infallible in certain matters on certain occasions. Thus Christ guaranteed that Peter would not fail in his teachings of the Faith. And if an infallible God says that He will make a certain man infallible, then that man will infallibly be infallible. Again the claim of the Pope is nothing like the claim of Satan. Satan claimed to be independent of God; the Pope claims to depend very much upon God. Nor does the Pope make himself equal to God. An infallible Pope is capable of sinning and losing his soul. And should a Pope do so, he would meet with a fate similar to that of Satan because of his unrepented sins. But he would not meet with that fate because of his claim to an infallibility which God insists upon giving him for the good of the Church whether he likes it or not.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty