What is Jesus's Gospel if you solely focused upon Jesus' Words Only? Bonhoeffer said it was a message of costly grace. Jesus called us to obey His words and His Father's commandments. While Luther in the early reformation taught faith alone, Luther tried changing course later. Luther started the reformation in 1517 relying upon his reading of Paul's Epistle to the Romans. However, by 1531, Luther realized that teaching of faith alone did not match what Jesus taught. His lieutenants -- Bucer and Melancthon -- developed a single new doctrine that was intended to supplant faith alone doctrine, at Luther's request. It was called DOUBLE JUSTIFICATION. This taught you were initially justified by faith alone. But then, as a Christian, you needed a second justification by works as indispensable to salvation. Thus, rather than passing over Jesus' words as belonging to a defunct dispensation, as is the common solution to the contradiction between Paul and Jesus, Luther retained Jesus, and during ecumenical negotiations with the Catholic church temporarily succeeded but ultimately failed to get the Catholic church to accept double justification. The point of the book Jesus' Words on Salvation is to only take encouragement from what Luther taught. The point is to find in Jesus' words His true doctrine about salvation, and then we will see what impelled even Luther to change direction.