Defining Lutheran Principles (6014) In this video, Dr. Rast identifies the defining characteristics of Lutheranism. Gemstones Membership Required You must be a Gemstones member to access this content.Already a member? Log in here Christian Doctrine, Rev. Dr. Lawrence Rast Jr., The Lutheran Confessions, Varieties of BeliefChrist alone, faith alone, formal principle, grace alone, scripture alone, sola Christus, sola fide, sola gratia, sola scriptura