This useful and insightful volume aims to illustrate, espouse, and renew the discipline of doctrinal theology, particularly as exemplified historically by Martin Luther and his theological reflection on the Trinity. The authors, steeped both in Luther's works and in the doctrinal tradition, show how dogmatics in the Lutheran tradition entails a delicate juxtaposition of credal commitment, scriptural interpretation, and doctrinal elaboration. Their respective chapters retrieve surprising historical insights about Luther's own practice of doctrinal theology, the interaction of the credal and doctrinal dimensions with a nuanced hermeneutic of scripture, and the future shape of a doctrinal theology genuinely responsive to the Gospel and the present age.