You are right there. It is not in the NT but the Gifts who spoke there. It is not about the letter but the Spirit. Meaning not the words you read but the Spirit Living those Words. It is not for the mind but a Life you Live. The Living Word was Jesus and not a "Bible". And the Living Word create Living Bibles. Not a written one.
2 Cor. 3:
1 Do we begin again to commend ourselves? or need we, as some others, epistles of commendation to you, or letters of commendation from you?
2 Ye are our epistle written in our hearts, known and read of all men:
3 Forasmuch as ye are manifestly declared to be the epistle of Christ ministered by us, written not with ink, but with the Spirit of the living God; not in tables of stone, but in fleshy tables of the heart.
4 And such trust have we through Christ to God-ward:
5 Not that we are sufficient of ourselves to think any thing as of ourselves; but our sufficiency is of God;
6 Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life.