Reformed theology affirms that Scripture and its teaching on grace and faith emphasize that salvation is solus Christus, “by Christ alone”—that is, Christ is the only Savior (Acts 4:12). B.B. Warfield wrote, “The saving power of faith resides thus not in itself, but in the Almighty Savior on whom it rests.”
The centrality of Christ is the foundation of the Protestant faith. Martin Luther said that Jesus Christ is the “center and circumference of the Bible” — meaning that who He is and what He did in His death and resurrection is the fundamental content of Scripture. Ulrich Zwingli said, “Christ is the Head of all believers who are His body and without Him the body is dead.”
Without Christ, we can do nothing; in Him, we can do all things (John 15:5; Phil. 4:13). Christ alone can bring salvation. Paul makes plain in Romans 1–2 that though there is a self-manifestation of God outside of His saving work in Christ, no amount of natural theology can unite God and man. Union with Christ is the only way of salvation.
We urgently need to hear solus Christus in our day of pluralistic theology. Many people today question the belief that salvation is only by faith in Christ. As Carl Braaten says, they “are returning to a form of the old bankrupt nineteenth-century Christological approach of Protestant liberalism and calling it ‘new,’ when it is actually scarcely more than a shallow Jesusology.” The end result is that today, many people—as H. R. Niebuhr famously said of liberalism—proclaim and worship “a God without wrath who brought men without sin into a kingdom without judgment through the ministrations of a Christ without a cross.”
Our Reformed forebears, drawing on a perspective traceable all the way back to the fourth-century writer Eusebius of Caesarea, found it helpful to think about Christ as a Prophet, Priest, and King. The 1689 London Baptist Confession, for instance, puts it this way: “Christ, and Christ alone, is fitted to be mediator between God and man. He is the prophet, priest and king of the church of God” (8.9). Let us look more closely at these three offices.