Jesus Christ is not the only foundation of the Church. Saint Peter is the one foundation of the Church, Jesus Christ built the Church upon him and named him the rock saying you are Rock and on this Rock I build my Church...
Tu es Petrus, et super hanc petram aedificabo ecclesiam meam...
συ ει πετρος και επι ταυτη τη πετρα οικοδομησω μου την εκκλησιαν Matthew 16:18
Jesus Christ is not the foundation of the Church at all. Christ is the Founder, not the foundation. He made Saint Peter, i.e., the Papacy, the foundation, which means the sure ground. Everything else is unsure ground. With the power of the keys to heaven and of "binding and loosing" (Matthew 16:19) which "binding and loosing" power Christ also gives to the apostolic college (the college of bishops). (Matthew 18:18) The Pope and the Bishops of the Catholic Church have the authority from Christ to teach the truth.
That Catholic principle is consonant with the epistle from today's OF Mass: 1 Timothy 3:14-16.
"The Church of the living God is the pillar and foundation of truth." Again, the Church is the foundation of truth, not Christ, not the Word, not the Bible, not faith alone or grace alone but the Church. And not the Church alone because the Church by her very nature is communion and she includes union with Christ being His Spouse, she includes the hierarchy: bishops, priests and deacons (cf. 1 Tim. 3: 1-13 is on the qualities of a bishop and a deacon), the communion of the saints and communion in the sacraments and the Bible is one of her most cherished Mass books, developed by Her.
Cf. Heretical Lauda Sion Translation (That would be "Hymnal Heresies 1")
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