Jesus, is the fullness of revelation, not the bible.
Jesus taught the Gospel to His apostles. In this Gospel He taught them everything and sent the Holy Spirit to teach them everything again and remind of all that He taught them.
Mk 4:34 “He did not speak to them without a parable, but privately to his own disciples he explained everything.”
[size=2]Mt 13:11[/size] "to you it has been given to know the secrets of the Kingdom of heaven”.
John 15:15 “for everything that I learned from my Father I have made known to you.”
John 14:26 “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.”
Jesus commanded His apostles to proclaim this Gospel, “He said to them, "Go into the whole world and proclaim the gospel to every creature. Whoever believes and is baptized will be saved; whoever does not believe will be condemned.” Mark 16:15-16
Thus Jesus taught salvation comes from believing the Gospel the apostles preached and taught.
But no where does the bible claim to have a summary of this Gospel that they preached and taught. There is not a single book, a single Chapter of the bible that claims to present this Gospel the apostles taught. The four written Gospels only claim to be a narrative of the life of Jesus. They do not claim to be a summary of the Gospel the apostles taught and preached.
Yet Jesus says salvation comes from believing this Gospel the apostles PROCLAIMED. That is because the apostles learned the Gospel from Jesus and NOT from reading scripture.
No where does Jesus say salvation comes from believing the Gospels they wrote.
No where does Jesus say salvation comes from the bible, scripture, or reading the bible or scripture.
So how do we know what is the content of the Gospel the apostles taught and preached, since it is NOT written down in the bible and since there is so much to learn that even the apostles could not remember it all without the help of the Holy Spirit?
All we have to do is find out what the early Christians believed, who learned from the apostles.
And the early Christians believed the same Catholic faith. Thus, the Gospel the apostles taught and preached was the Catholic faith.
So Jesus says salvation comes from believing the Gospel His Church teaches and preaches and NOT from reading scripture. But scripture is good for illuminating some of the teachings of the Gospel.
And scripture is good for salvation history. And we must believe it because it is the Word of God.
But salvation does not come from believing this Gospel they wrote, but from believing the Gospel the apostles preached, the Catholic faith.