Thielicke here studies the themes of doubt and appropriation in modern Protestant thought. A leading advocate of dialectical theology, Thielicke examines the work of the great German Protestant religious philosophers from Lessing and Schliermacher through Barth and Tillich, probing these theologians' understanding of their context and how this tradition can impact our own engagement with our times. Clear, finely nuanced, historically and philosophically mature, this is a vital reflection on the history of theology and in systematic theology.