De Sade is the one completely consistent and thoroughgoing revolutionary of history.

In this quote, Aldous Huxley refers to the French philosopher and writer Marquis de Sade, calling him the "completely consistent and thoroughgoing revolutionary of history." Huxley is asserting that de Sade, known for his controversial works that explore sexual freedom, savagery, and the rejection of conventional morality, is a unique figure in history due to his unwavering commitment to challenging societal norms. Huxley suggests that de Sade's radical ideas make him an outlier in the history of revolutionary thought.

De Sade is often remembered for his works that critique religious and social structures, advocating for absolute individual freedom and the dismantling of established authority. Huxley’s statement implies that de Sade’s philosophy, though extreme, is a pure form of rebellion—one that does not compromise or dilute its message to fit within mainstream ideas of revolution. According to Huxley, de Sade's consistency in his radical views sets him apart from other revolutionaries who may compromise their principles in the pursuit of change.

The quote also reflects Huxley’s broader interest in the complexities of human nature and the tension between individual liberty and society's rules. Huxley was known for his exploration of the darker aspects of society and the human psyche, particularly in works like Brave New World. By invoking de Sade as a "revolutionary," Huxley draws attention to the potential consequences of extreme freedom without moral constraints and how such ideas can challenge the very foundations of civilization.

Originating from Aldous Huxley, a writer known for his keen insights into social and psychological issues, this quote reflects his interest in the radical figures throughout history who have pushed against the boundaries of morality and authority. Huxley’s fascination with figures like de Sade reveals his broader questioning of the limits of freedom, societal control, and the complexities of human behavior.