Matthew S. Harmon traces the argument of Paul’s most polemic letter. In Galatians, Paul defends his authority and attacks his opponents’ arguments—and in both cases, the decisive factor is the Gospel. History and Scripture must be interpreted in light of Christ’s arrival. The new creation has broken in, leaving nothing unaltered. Harmon plumbs Galatians’ theological depth, including its view of sin and exile, apocalyptic antitheses, the Trinity, Isaiah’s servant figure, the law, righteousness, and faith(fulness).