This is a book that I imagine Piper will still be known for in decades to come. A beautiful, Piper-y demonstration of the self-attesting authority of the Scriptures. I can't claim to have agreed with all of the detail, but I can claim to have rejoiced in many helpful insights he offers.
Piper is driven by the conviction that people don't need to be expert historians to have a well-grounded confidence in the authority of the Bible as the word of God. In fact, people don't even need to understand why they have a well-grounded confidence to have a well-grounded confidence. Rather, they can just find themselves captivated by a sight of the glory of God shining through the Scriptures. In Piper's words, "We know the Scriptures to be true, not because our light shows them to be so, but because their divine light shines with its own unique, all-enlightening, all-explaining glory" (160). As he says in another place, "Sight is its own argument" (250).
The peculiar glory of God revealed in the Scriptures is the glory of "majesty in meekness." Piper gets particularly passionate at this point, as he describes how the Scriptures are self-authenticating because they manifest a God who "wins the praise of his majesty not by amassing slave labor to serve him but by becoming a servant to free the slaves of sin" (217) – that is, who does not exalt himself by demanding to be served, but exalts himself by serving others.
One of the most helpful chapters is on the inward testimony of the Holy Spirit. Piper helpfully explains how this inward testimony is not about the Spirit giving additional revelation, in the form of information about the Bible, but rather "he awakens us, as from the dead, to see and taste the divine reality of God in Scripture, which authenticates it as God's own word" (186). Historical and apologetic arguments do have a place, but as "secondary aids to our feebleness" (in Calvin's words) to encourage us when our sight of God's glory is clouded.
The final section of the book offers an enlightening slant on some traditional approaches to defending the authority of the Bible, by highlighting three ways that the Scriptures put the peculiar glory of God on display. First, the fulfilment of prophecy – not just the fact of fulfilment, but also its manner, as the Promised One shows "majesty in suffering" (235). Second, the miracles of Jesus, which are done "in the service of humble God-exaltation, not crowd-pleasing self-exaltation" (248). Third, the creation of new people, transformed from selfishness to be "God-centered, Christ-exalting servants who live for the temporal and eternal good of others" (254).
Take, read, and be encouraged.