RPM, Volume 12, Number 5, January 31 to February 6 2010 Selected from the Writings of Martin Luther * *Selected from What Luther Says, an anthology compiled by Edwald M. Plass, Vol.2, pp.702-704, 715-718. Martin Luther "This doctrine [justification by faith] is the head and the cornerstone. It alone begets, nourishes, builds, preserves, and defends the ch..