Consider this story told by Saint Augustine (Confessions: Book VIII, Chapter II), of a certain Victorinus; a great man of Rome, who at first attempted to deny his need for the Church, falsely claiming to be a Christian without the Church.
To Simplicianus then I went, the father of Ambrose (a Bishop now) in receiving Thy grace, and whom Ambrose truly loved as a father. To him I related the mazes of my wanderings. But when I mentioned that I had read certain books of the Platonists, which Victorinus, sometime Rhetoric Professor of Rome (who had died a Christian, as I had heard), had translated into Latin, he testified his joy that I had not fallen upon the writings of other philosophers, full of fallacies and deceits, after the rudiments of this world, whereas the Platonists many ways led to the belief in God and His Word. Then to exhort me to the humility of Christ, hidden from the wise, and revealed to little ones, he spoke of Victorinus himself, whom while at Rome he had most intimately known: and of him he related what I will not conceal. For it contains great praise of Thy grace, to be confessed unto Thee, how that aged man, most learned and skilled in the liberal sciences, and who had read, and weighed so many works of the philosophers; the instructor of so many noble Senators, who also, as a monument of his excellent discharge of his office, had (which men of this world esteem a high honour) both deserved and obtained a statue in the Roman Forum; he, to that age a worshipper of idols, and a partaker of the sacrilegious rites, to which almost all the nobility of Rome were given up, and had inspired the people with the love of
The monster Gods of every kind, who fought
'Gainst Neptune, Venus, and Minerva:
O Lord, Lord, Which hast bowed the heavens and come down, touched the mountains and they did smoke, by what means didst Thou convey Thyself into that breast? He used to read (as Simplicianus said) the holy Scripture, most studiously sought and searched into all the Christian writings, and said to Simplicianus (not openly, but privately and as a friend), "Understand that I am already a Christian." Whereto he answered, "I will not believe it, nor will I rank you among Christians, unless I see you in the Church of Christ." The other, in banter, replied, "Do walls then make Christians?" And this he often said, that he was already a Christian; and Simplicianus as often made the same answer, and the conceit of the "walls" was by the other as often renewed. For he feared to offend his friends, proud daemon-worshippers, from the height of whose Babylonian dignity, as from cedars of Libanus, which the Lord had not yet broken down, he supposed the weight of enmity would fall upon him. But after that by reading and earnest thought he had gathered firmness, and feared to be denied by Christ before the holy angels, should he now be afraid to confess Him before men, and appeared to himself guilty of a heavy offence, in being ashamed of the Sacraments of the humility of Thy Word, and not being ashamed of the sacrilegious rites of those proud daemons, whose pride he had imitated and their rites adopted, he became bold-faced against vanity, and shame-faced towards the truth, and suddenly and unexpectedly said to Simplicianus (as himself told me), "Go we to the Church; I wish to be made a Christian." But he, not containing himself for joy, went with him. And having been admitted to the first Sacrament and become a Catechumen, not long after he further gave in his name, that he might be regenerated by baptism, Rome wondering, the Church rejoicing. The proud saw, and were wroth; they gnashed with their teeth, and melted away. But the Lord God was the hope of Thy servant, and he regarded not vanities and lying madness.
N.B. The Gospel for today's Mass (Luke 9:18-22) also bears this out, for it is Saint Peter alone (the leader of the disciples--the Church) who recognizes and reveals who Jesus is. The source of this revelation is not the Bible but the Holy Spirit Who moved the Pope, and the New Testament writings were based on that! The disciples first recognized Jesus as Christ (the Messiah) by the revelation to Saint Peter, the first Pope. They got it wrong. Only Peter had it right! Only Peter knew Christ correctly. Those with Peter get it right.