The following testimonial can be found on the back jacket of John Piper’s Counted Righteous in Christ: Should We Abandon the Imputation of Christ’s Righteousness? (Crossway Books, 2002).

This is certainly the most solid defense of the imputed righteousness of Christ since the work of John Murray fifty years ago. I’m delighted that Dr. Piper has established that important doctrine, not as a mere article from the confessional tradition, but on the solid foundation of God’s Word. — John M. Frame, Professor of Systematic Theology and Philosophy, Reformed Theological Seminary, Orlando

Quite the endorsement, that. Know what’s even better? John Piper’s book is available for free in PDF form through Desiring God Ministries. Enjoy!