Book excerpt: In this book Ralph Smith delves deeper into the discussion at the intersection of covenant and trinitarian theology that he began with 'Paradox and Truth.' Though many Reformed theologians have recognized an agreement between the Father and the Son for the salvation of the human race, few have explored the vast theological possibilities of an eternal covenant that involves all three persons of the Trinity. Instead, covenantal soteriology has focused on the so-called covenant of works between God and Adam, which turns out to be problematic both biblically and theologically. Smith places the eternal covenant in the position it deserves - the keystone of biblical and systematic theology - with profound consequences for the Christian worldview.