The book opens by tracing the historical evolution of psychiatry, moving away from superstition toward medical science, and establishes that mental disorders represent quantitative modifications rather than absolute departures from normal psychology. Hirsch then undertakes a detailed psychological analysis of genius, contrasting the spontaneous, dream-like creative fancy of poets and composers with the rigorous, self-conscious intellectual function required by scientific investigators. The author demonstrates that while artists like Goethe and Mozart relied on unprompted inspiration and deep emotional resonance, others like Schiller and Beethoven operated through deliberate artistic construction or intense intellectual discipline. A significant portion of the work investigates the alleged affinity between genius and insanity, critically evaluating historical accounts of hallucinations and eccentricities among famous individuals.
Hirsch argues that these phenomena are often misdiagnosed symptoms of health magnified by superior mental development rather than indicators of true psychical disease. The discussion extends to the concept of degeneration as defined by Morel, analyzing how mental disproportions, hereditary predispositions, and developmental disturbances manifest in society. The text also emphasizes the critical role of early education and maternal influence in shaping character and preventing psychological instability. Finally, the author addresses the phenomenon of secular hysteria and the prevalence of mysticism and pseudo-geniuses in contemporary culture, concluding that true genius requires a harmonious balance of all mental faculties.
