My thanks to Justin Taylor for this:
John Piper’s foreword to Faith Alone: The Doctrine of Justification, by Thomas Schreiner:
Knowing from James 2:26 that there is such a thing as dead faith; and from James 2:19 that there is such a thing as demonic faith; and from 1 Corinthians 15:2 that it is possible to believe in vain; and from Luke8:13 that one can “believe for a while, and in time of testing fall away;” and knowing that it is through faith that we are born again (1 John 5:1) and have eternal life (John 3:16, 36), therefore, surely we must conclude that the nature of faith, and its relationship to salvation, is of infinite importance.
I use the word infinite carefully. I mean that, if we don’t have such faith, the consequences have infinite significance. Eternal life is an infinite thing. And thus the loss of it is an infinite thing. Therefore, any human concern that has only to do with this world, no matter how global, no matter how painful, no matter how enduring—if it has only to do with this world—compares to the importance of saving faith as a thimble to the ocean.
Which means, this book is dealing with treasures of immeasurable importance. Infinity cannot be measured. And infinite things are at stake. As TomSchreiner says, the book “tackles one of the fundamental questions of our human condition: how can a person be right with God?”
The stunning Christian answer is: sola fide—faith alone. But be sure you hear this carefully and precisely: He says right with God by faith alone, not attain heaven by faith alone. There are other conditions for attaining heaven, but no others for entering a right relationship to God. In fact, one must already be in a right relationship with God by faith alone in order to meet the other conditions.
“We are justified by faith alone, but not by faith that is alone.” Faith that is alone is not faith in union with Christ. Union with Christ makes his perfection and power ours through faith. And in union with Christ, faith is living and active with Christ’s power.
Such faith always “works by love” and produces the “obedience of faith.” And that obedience— imperfect as it is till the day we die—is not the “basis of justification, but . . . a necessary evidence and fruit of justification.” In this sense, love and obedience—inherent righteousness—is “required of believers, but not for justification”—that is, required for heaven, not for entering a right-standing with God.
Everything in this book is measured by the Scriptures. “We should hold to the tradition of sola fide because it accords with the Word of God.” Therefore, thematically and structurally, the center of the book is biblical exegesis. “In this book I attempt to tour the historical teaching of the church, explain the scriptural teaching on justification, and provide some sense of contemporary relevance” (emphasis added).
But even in the historical and contemporary sections, Scripture remains the lodestar, guiding the ship of Schreiner‘s analysis. Thus the book is overwhelmingly constructive rather than merely polemical—and always careful, for when handling the most volatile issues, one must handle with care.
Schreiner is unusually careful in handling viewpoints that are different from his own. I have never read another author who states his challenger’s viewpoint so fully and persuasively, that it seems so compelling, and then turns around and demolishes it one piece at a time with careful biblical observation and argumentation. It is a trait that awakens trust.
Schreiner does not play God. He does not render judgments about men’s souls, only their doctrines. He follows John Owen in the gracious position that “men may be really saved by that grace which doctrinally they do deny; and they may be justified by the imputation of that righteousness, which, in opinion, they deny to be imputed.”
His aim is not to defeat others or merely win arguments; his aim is the glory of God and the everlasting joy of people. “Sola fide gives all the glory to God, so that no one will boast in human beings (1 Cor. 1:31).” This is true not only because Christ is the sole ground of our right standing with God, but also because faith itself is a gift: “No one can boast about faith, for faith itself is a gift of God.” Moreover, faith, by its very nature, “glorifies and honors God, for it confesses that God can do what he has promised.”
And this faith is no mere mental assent, but a heartfelt embrace of Jesus Christ as its all-satisfying treasure. “Justification is by faith alone, for faith finds its joy in Christ alone, seeing him as the pearl of great price, the one who is more desirable than anything or anyone else” (emphasis added).
Thus Schreiner closes his book with a joyful testimony—and I rejoice to join him in it: ”My confidence on the last day . . . will not rest on my transformation. I have too far to go to put any confidence in what I have accomplished. Instead, I rest on Jesus Christ. He is my righteousness. He is the guarantor of my salvation. I am justified by faith alone, in Christ alone, to the glory of God alone.”