See quotes from the Introduction here.
A quick survey of history would show the church errs and leaves its central task of proclaiming the gospel at precisely the point where it begins to lose its grip on a biblical doctrine of Scripture.
In our affirmation of the full, unique, divine authority of Scripture, and of the consequent possible fallibility of every human constriction of doctrine, we are not at the same time affirming that everything to which we confessional folk subscribe is only and always provisional; fallibility and provisionality are not two sides of the same coin… Fallibility does not entail provisionality.
For the Reformed, however, because Scripture is inspired, it provides its own criteria for cannon, thus is its own self-referential authority.
The authority of Scripture in no way rests on the church or its councils, or on any man. Rather its authority rests on its author, God, and is to be received because it is His Word.
To put the matter philosophically, Scripture’s warrant rest solely and completely in itself, because of what it is, the very Word of God.
The point is that Scripture is the Word of God because God, who is truth, is its author.
It is incumbent on those who hear it or read it, therefore, to receive it because it is God Himself speaking in and through every word of it.
God is the primary author of Scripture, and men are instrumental secondary authors. And, if instruments, then what men write down is as much God’s own words as if he had written it down without human mediation.
Peter acknowledges that in some places [the Scriptures] are hard to be understood, and were misconstrued by some unlearned and unstable one, to their own ruin; yet neither he nor Paul, who was yet alive and well knew of this wrestling with his Epistles, clear or amend those difficulties, but let them alone as they were: for the Holy Ghost hath penned Scripture as to set me to study. (John Lightfoot, The Harmony, Chronicle, and Order of the New Testament, vol. 3 of The Whole Works of the Reverend and Learned John Lightfoot, ed. John Rogers Pitman (London: J. F. Dove, 1822), 327.
Scripture is essentially authoritative, that is its nature.
The doctrine of Scripture presented here is no abstract doctrine, but is the only way in which we can begin rightly to see who God is and how we might properly worship Him.
The means that revelation must be the ground for everything else that we know, in theology and in any other sphere of life.
Without revelation as or principium, we have no foundation or ground for any knowledge, including, but not limited to, our knowledge of God in Christ.