"Religion within the limits of simple mental cognition. The text of the 1793 edition, including the deviations of the 1794 edition" is a fundamental philosophical work of the German philosopher Immanuel Kant. In the book, the author analyzes the nature of religion, defines its place in the field of mental cognition, and considers the possibility of differences between human understandings of religion. The 1793 edition is known for its very complex and profound thoughts on religion and morality, and the inclusion of the deviations of 1794 allows us to trace the evolution of Kant's views in the years after the publication of the original work. This book is an indispensable source for understanding Kantian philosophy and an invaluable contribution to Eastern European thought of the era Enlightenment.