Thus is it from God

“Thus God, who himself began the writing of the word with his own finger, Exod. xxxi. 11. after he had spoken it, Exod. xx. appointing or approving the writing of the rest that followed; Deut. xxxi. 12. Josh, xxiii. 6. 1 Kings ii. 3. 2 Kings xiv. 6. xvii. 13. 1 Chron. xxi. 15. 2 Chron. xxv. 4. Ezek. ii. 9, 10. Hab. ii. 2. Luke xvi. 29. John v. 39. xx. 31. Acts xvii. 11. doth lastly command the close of the immediate revelation of his will, to be written in a book; Rev. i. 11. and so gives out the whole of his mind and counsel unto us in writing; as a merciful and stedfast relief, against all that confusion, darkness, and uncertainty, which the vanity, folly, and looseness, of the minds of men, drawn out and heightened by the unspeakable alterations, that fall out amongst them, would otherwise have certainly run into. 

“Thus we have laid down the original of the Scriptures, from the Scripture itself; and this original is the basis and foundation of all its authority. Thus is it from God; entirely from him; as to the doctrine contained in it, and the words wherein that doctrine is delivered, it is wholly his; what that speaks, he speaks himself. He speaks in it, and by it; and so it is vested with all the moral authority of God over his creatures.”

John Owen, The Works of John Owen, Volume 4, pp. 399-400