Peter Chaadaev (1794-1856) is rightfully considered to be one of the forerunners of modern Russian philosophy. There is a famous scene from his life that may help us to understand both his own thought as well as the whole subsequent tradition of Russian religious philosophy. When Chaadaev finished his studies of Kant's Critique of Pure Reason, he crossed out the title on the cover and wrote beneath it Apologete adamitischer Vernunft (An Apology for Adamic Reason). Russian religious philosophy was supposed to be a critique of such secular reason. In this book we seek a contemporary interpretation of Chaadaev's thought and its influence. Our authors, including such scholars as Andrzej Walicki and Boris Tarasov, investigate his views on religion, society, history, politics, and Russian fate. Chaadaev turns out to be a crucial figure who continues to influence Russian religious philosophy to this day.