John 17:17 Sanctify them in the truth; your word is truth.
. And it's not just a Sacred Text, the Bible, that's "Your Word."
The Apostles and the local Churches they planted before 100 AD, and many after that point as well, didn't have the New Testament in writing. They had it in walking and talking, in preaching and teaching, in living and in dying, in life and death. They didn't read it. They lived it.
That's why St. Paul didn't say "First, printing presses!"
No, he sees the writing as being embodied in people:
2 Corinthians 3:2
You yourselves are our letter, written on our hearts, known and read by everyone.
2 Corinthians 3:3
You show that you are a letter from Christ, the result of our ministry, written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of human hearts.
He's very clear that his spoken words are authoritative whether they are written or not:
2 Thessalonians 2:15 (King James Bible)
"Therefore, brethren, stand fast, and hold the traditions which ye have been taught, whether by word, or our epistle."
.