Although "Sola Fide" (Faith Alone) was at the heart of Luther's Reformation principle of justification by faith alone, other Sola's also became part of the Reformation. These were Sola Gratia (Salvation by Grace Alone), Solus Christus! (By Christ's Work Alone are We Saved), Sola Scriptura (The Scripture Alone is the Standard) and Soli Deo Gloria! (For the Glory of God Alone.)