"The Waning of the Middle Ages" is a historical analysis of the cultural life of the late Middle Ages, particularly in France and the Low Countries, during the 14th and 15th centuries. It delves into the period's modes of thought, forms of expression, religious beliefs, and social norms. The book argues that the era was characterized by a highly stylized and overwrought civilization, marked by an excessive emphasis on chivalry and courtly love, a religious mindset dominated by the fear of death and the afterlife, and a cultural milieu that was both highly imaginative and deeply pessimistic.

This seminal political theory text delves into the role of the state in society and the necessity of proletarian revolution to dismantle the bourgeois state apparatus. It argues that the working class must seize state power, dismantle the existing state machinery, and establish a dictatorship of the proletariat as a transitional phase towards the creation of a classless, stateless society. The work critically analyzes the ideas of Marx and Engels on the state, while also addressing the practical aspects of revolution, including the suppression of the bourgeoisie by the proletariat. It serves as a theoretical foundation for understanding the dynamics of class struggle and the path towards socialism.

"Fallen Leaves" is a collection of philosophical and autobiographical essays that delve into the author's musings on a wide range of topics, including religion, sexuality, and society. The work reflects the author's critical examination of modernity and the decline of traditional values, as well as his personal sense of isolation and disillusionment with the contemporary world. Through a series of fragmented and often controversial reflections, the author grapples with the existential challenges of his time, presenting a candid and introspective exploration of the human condition at the turn of the 20th century.