Religion within the Bounds of Bare Reason (German: Die Religion innerhalb der Grenzen der bloßen Vernunft) is a 1793 book by the German philosopher Immanuel Kant. Although its purpose and original intent has become a matter of some dispute, the book's immense and lasting influence on the history of theology and the philosophy of religion is indisputable. It consists of four parts, called "Pieces" (Stücke), originally written as a series of four journal articles.