Nope, that is where Catholics and Protestant part. Catholics think Scripture have to claim it, yet they have no problem when Protestant advocate the Trinity not found directly in Scripture, but indirectly. The same way that we know that Scripture is Authority it is the inspired, inerrant Word of God something nothing else in the Catholic Church can’t claim.
Rather to prove the Catholic Church should have the authority one has to prove it’s inspired by God and inerrant, and this is doubly hard since Catholics admit to their being error and bad Popes therein in tines past.
You are incorrect. The Catholic Church affirms that Sacred Scripture is the inspired, inerrant word of God.
Holy Tradition and the Magisterium of the Church are not inspired, but they do have the charism of being infallible. This charism is through the Holy Spirit.
Jesus said, “When the Spirit of truth comes, he will guide you into all the truth; for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come.” (John 16:13)
He also said, “But the Counselor, the Holy Spirit, whom the Father will send in my name, he will teach you all things, and bring to your remembrance all that I have said to you.” (John 14:26)
Jesus also said, “And I tell you, you are Peter, and on this rock I will build my Church, and the gates of Hades shall not prevail against it. I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven.” (Matthew 16:18-19)
Jesus gave a guarantee that the Catholic Church could not teach error in faith and morals. That is the charism of infallibility. The Catholic Church’s authority does not stem from decrees of man - it is divinely inspired. Jesus founded the Church and guaranteed that the Holy Spirit would lead it into all truth. This is why the Catholic Church recognizes that Sacred Scripture, Holy Tradition, and the Magisterium of the Church are the three inter-related rules of faith and morals.
Sola scripturists deny what Jesus said in Holy Scripture. They deny the authority of the Church. They hold up a false doctrine that is not taught in scripture (what they claim is the only (sola) rule of faith and morals).
Catholics don’t believe in sola scriptura, but we can show where the authority of the Church derives from using scripture. Tradition and the Magisterium of the Church are valid authorities because they were instituted by Jesus Christ and are protected by the Holy Spirit from teaching error in faith and morals.
Yes, there have been bad Popes, and even with that, the Catholic Church has never taught error in faith and morals. That in and of itself is a miracle and could only be possible through the protection and guidance of the Holy Spirit.
Protestant sects don’t have the guidance of the Holy Spirit, which is why they are in the mess they are in today. St. Paul gave us a description of the state of protestantism today when he said, “And since they did not see fit to acknowledge God, God gave them up to a base mind and to improper conduct.” (Romans 1:28)
All the sola scripturists have to do to change my mind is show where in Holy Scripture sola scriptura is plainly taught.