The recent books on the life of Luther by Dr. Preserved Smith and Dr. A. C. McGiffert may well rouse new consideration of Luther's religious experience. America was dominated by Calvinism, but there is small reward today in going back to Calvin, who applied the logic of a legal mind to a subject beyond the sphere of jurisprudence. Luther, on the other hand, was trying to utter the apprehensions of a great heart. Calvin's thought is dead. Luther's heart still throbs. We shall perhaps understand our own hearts more clearly if we apply religious psychology to his.