What's missing?

Jumping backwards, just because my bookmark was in the wrong spot, we go back to the beginning:

...the question is about the means of salvation, how it is accomplished. Here John Piper, and the tradition he represents, have said that salvation is accomplished by the sovereign grace of God, operating through the death of Jesus Christ in our place and on our behalf, and appropriated through faith alone. Absolutely. I agree a hundred percent. There is not one syllable of that summary that I would complain about. But there is something missing—or rather, someone missing. Where is the Holy Spirit?In some of the great Reformed theologians, not least John Calvin himself, the work of the Spirit is every bit as important as the work of the Son. But you can't simply add the Spirit on at the end of the equation and hope it will still have the same shape. Part of my plea in this book is for the Spirit's work to be taken seriously in relation both to Christian faith itself and to the way in which that faith is “active through love” (Galatians 5:6). and the way in which that Spirit-driven active faith, at work through love and all that flows from it, explain how God's final rescue of his people from death itself has been accomplished (Romans 8:1-11).—Justification, pages 10-11

<idle musing>
Yes! The work of the Holy Spirit is central to the Christian life, yet it is so often overlooked. It is all too common for people to get someone to acknowledge the atoning sacrifice of Jesus and then hand that someone a Bible and tell them to read it. As if that block of wood, thinly sliced, all by itself, will transform you! NO! It is only as the Holy Spirit quickens the words in that book that they have any power. It is always, yes, always, through the power of God, the Holy Spirit, that we are transformed—or, better yet, have been transformed.
</idle musing>