Toshimasa Yasukata offers a detailed study and interpretation of the German theologian Ernst Troeltsch, discerning a systematic unity in his thought. Despite the obvious diversity of his interests and published works, Troeltsch is shown to be thoroughly consistent in exploring the possibility of establishing normative values in the face of the relativizing efforts of history. In his closing remarks, Yasukata suggests the wide-ranging significance of Troeltsch's work for the future of theology.