This book argues that the rediscovery of mystical theology in nineteenth-century Germany not only helped inspire idealism and romanticism, but also planted the seeds of their overcoming by way of critical materialism. Thanks in part to the Neoplatonic turn in the works of J. G. Fichte, as well as the enthusiasm of mining engineer Franz X. von Baader, mystical themes gained a critical currency, and mystical texts returned to circulation. This reawakening...