Robert Letham's award-winning The Holy Trinity receives a well-considered update in this revised and expanded new edition. Letham examines the doctrine of the Trinity's biblical foundations and traces its historical development through the twentieth century before engaging four critical issues: the Trinity and (1) the incarnation, (2) worship and prayer, (3) creation and missions, and (4) persons. The new edition addresses developments in Augustine studies, teaching on the Trinity and election in Barth studies, and contemporary evangelical disputes on the relation of the Son to the Father.