Whatever authority the Bible carries as a trustworthy book, it derives from the trustworthiness if the divine revelation it discloses and ultimately from the Spirit who infallible speaks through it.
In declaring the trustworthiness of the Bible, therefore, we must keep in mind that it is ultimately not the book itself which we are affirming. Rather, we are confessing our faith in the Spirit who speaks his revelatory message to us thought the pages of Scripture. In declaring its infallibility and inerrancy, we are actually affirming the trustworthiness of the Spirit whose vehicle the Bible is.
Stanley J. Grenz, Theology for the Community of God, pp.402-403