Paul’s reading of the Old Testament witnesses to the significance of the Old Testament from a specifically Christian way. This study argues that a theological approach to understanding Paul’s appeal to and reading of the Old Testament, especially Isaiah, offers important insights into the ways in which Christians should read the Old Testament and a two-testament canon today. By way of example, this study explores the ways in which Isaiah 40–66’s canonical form presents the gospel in miniature with its movement from Israel to Servant to servants. Paul follows this literary movement in his own theological reflection in 2 Corinthians 5:14–6:10. Jesus takes on the unique role and identity of the Servant of Isaiah 40–55, and Paul takes on the role of the servants of the Servant in Isaiah 53–66. Based on this exegetical exploration, Gignilliat asks if Paul the sensus plenior of Scripture. Does Paul’s reading of the Old Testament look anything like a plain sense reading? Gignilliat concludes that Paul is reading the Old Testament in such a way that the literal sense and its figural potential and capacity are not divorced but are actually organically linked in what can be termed a “plain sense” reading.