"An Iron Will" by Orison Swett Marden, is a motivating-though quick-read. Written before "Think and Grow Rich" by Napoleon Hill, it is easy to imagine that Marden's book inspired and provided the framework for the Napoleon Hill book. "An Iron Will" isn't the kind of book you read-it's the kind of book you study. Written for those who are searching for a higher power to guide their lives, "An Iron ...