Well, as I indicated, I’m interested in what Jesus actually said Himself.
“John 16:12 I have yet many things to say unto you, but ye cannot bear them now.
13 Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.”
Jesus tells the apostles the night he was betrayed that he had a lot more to teach them and he would by the Holy Spirit. These teachings were to be of equal authority with the “red letters.”
All scripture is God-breathed.