Religion within the Boundaries of Mere Reason, a work of major importance in the history of Western religious thought, represents a great philosopher's attempt to spell out the form and content of a type of religion that would be grounded in moral reason and would meet the needs of ethical life. This volume presents it, together with three short essays that illuminate it, in a new translation by Allen Wood and George di Giovanni, with an introduction by Robert Merrihew Adams that locates this essential essay in its historical and philosophical context.