There are often rumors and tales of ancient biblical wisdom lost many centuries ago; and often this is the case, books and writings are found that contain historical perspectives & ideas that are valuable and provide insight into ancient Christianity. There are even a few historical books mentioned in the Old Testament that are nowhere to be found.
This brings up a question people often wonder about: is it possible that are there vital things, meaning books of the bible that should be in our modern canon but instead are lost and missing?
Short answer: No.
Longer answer: I trust God has preserved His word as He wanted to.
“The grass withers, the flower fades, but the word of our God will stand forever.” Isaiah 40:8
God fulfills His plans and goals. He wanted Christ to be born and die… thus it happened, and an infinite army of Herods could never stop it.
If we trust that the Word of God is living, active, and produces fruit, we must trust that the Author has given it to us in its entirety for His purposes to be fulfilled.
If you think that somehow a vital part of Gods truth has been lost due to the will of man or satan, then you trust in a God who is weak and prone to be controlled by men.
Then salvation and truth becomes esoteric and only the enlightened few who exert much effort obtain it, whereas the Word of God tells us that Grace is the exact opposite. No work, effort, or striving can earn it, it is a gift revealed by God to the weak to shame the strong.
Even Paul, a wicked pharisee who God chose to use in order to reveal His truth to the gentiles could not escape Gods plan. Paul writes “He who had set me apart before I was born, and who called me by His grace, was pleased to reveal His Son to me, in order that I might preach Him among the Gentiles.” (Gal 1:15-16)
He also says “I became a minister according to the stewardship from God that was given to me for you, to make the word of God fully known.” (Col 1:25)
Christ came to reveal the Word to us. If we believe in a weak, incomplete, fallible, uncertain revealed Word, then our Christ is described with the same vocabulary.