The opening portion of the text introduces the reader to the prominent social attitudes of the time, noting a pronounced tendency toward the pursuit of material enjoyment that emerged in France from the mid-19th century onwards. Charpentier discusses the rise of pessimism as a philosophical response to the overwhelming disillusionment with life and its hardships, contrasting it with earlier concepts of melancholy. He sets the tone for an in-depth study of the condition he refers to as "the moral illness of the century," aiming to trace its historical manifestations and understand its implications for contemporary society. This preliminary discussion establishes a framework for further exploration into the societal impact of this malaise, its proponents, and symptoms, offering insight into the literary reflections of that period. (This is an automatically generated summary.)