@chisa96 Said
A text cannot be evidence of its own validity. As you say, all we have now of jesus's teachings is contained within this text; therefore jesus's teachings cannot be evidence of the bible's validity.
It's called faith for a reason, man. At least embrace the fact that by definition, it cannot be proven. Be proud that you have that faith rather than belittling the power of it by trying to prove and justify what you believe in when it cannot be done.
You come across as someone who is embarrassed in his unwaivering faith, who sees it as a weakness rather than a strength. You are constantly desperate to prove your perspective, but in proving the existance of god and the divinty of christ, you destroy faith entirely.
I have not said that the bible is the proof of it's own validity, but it's validity allows us to take Christ's teachings to heart.
As I have said many times, the proof of the validity of the bible is in it's prophetic accuracy, a "yardstick" it itself sets. Deuteronomy 18:21,22 "And in case you should say in your heart: “How shall we know the word that Jehovah has not spoken?” 22 when the prophet speaks in the name of Jehovah and the word does not occur or come true, that is the word that Jehovah did not speak. With presumptuousness the prophet spoke it. You must not get frightened at him.".
The only prophecies that have not come true are not yet due to, some are happening as you read this. It is true that not all are easy to understand without using other scriptures to "decode" them, and as the angle told John when giving him revelation, some prophecies are simply not meant to be understood at the time, but would be understood when the time was right. God does tend to work on a "need to now basis" especially with prophecy.
Since prophecy is so demonstrably accurate, some so much so that people have tried, unsuccessfully, to claim that they were written after the fact, the bile has passed the test of validity, and proven itself to be truly the word of God. Therefore the claim that it is the final arbiter in spiritual matters is also proven,since God cannot lie.