"The Source of Cacomonas: The Legacy of Dr. Pangloss as a Supplement to Candide" - a book by the French writer Simon Nicolas Henri Lange - is a thought-provoking philosophical work that analyzes the essence of human nature. The author examines the question of the nature of good and evil through the prism of sharp contradictions of life. Each character in the book is a symbol of certain aspects of deep philosophical questions. Lenge's literary masterpiece leaves behind a unique legacy that leaves the reader with a stream of fresh thoughts, ideas and contrasts.