It is pretty uncontroversial to say something like this: the greatest theological mystery is the Trinity. But on the basis of this book review, I wonder if equal or close equal in mystery is the question of salvation.
Recently here I raised some questions about the Epistle to the Romans and what its central concern is. A good debate ensued. Critical to all debates on Romans (and Galatians) is the question of God's grace, our salvation, becoming right with God and continuing to live in a right relationship with God. In those posts I touched on the debate engendered by the so-called New Perspective on Paul (NPP).
As that debate rages on in scholarship (and also in approaches preachers are taking to preaching Pauline epistles), it is obvious that the opportunity is ripe for some kind of bridging between the NPP and the "old perspective". John Barclay's recent book Paul and the Gift is the best candidate I know of to be that bridge.
Accordingly, I encourage you to read the review by Tim Foster (who teaches Down Under at Ridley College, Melbourne).
Not only does he question whether this book is "that bridge", he also lays out beautifully and simply the complex thesis which Barclay advances.
And as he does so, Foster sets out the great theological dilemma of understanding salvation by grace. What does grace expect of us after we are saved (or, if you like, as we are being saved)?
Fascinatingly, the answer involves compliments to Calvinism ...