In the early nineteenth century, a philosopher with a razor-sharp mind and a disposition darker than a moonless night unleashed an idea so potent, so insidiously logical, that it has been quietly rewiring human consciousness ever since. Arthur Schopenhauer declared the world a theater of blind, insatiable Will—a cosmic force that drives everything from the growth of weeds to the ache of unrequited love—and concluded that suffering is not an accident of existence but its very essence. It was, by any measure, a terrible thing to tell people. And yet millions have found it impossible to unhear.

The Germ of Pessimism traces the strange career of Schopenhauer's philosophy as a contagion—a bacillus of the mind that, once contracted, alters the way its host perceives reality. Boris Kriger follows this intellectual infection from its origins in Schopenhauer's parlor to its mutations in the works of Tolstoy, Nietzsche, Wagner, and Beckett, and onward into the modern world, where it thrives in social media algorithms, antinatalist forums, and the anxious dreams of artificial intelligence researchers. Along the way, he asks an uncomfortable question: is pessimism a disease of privilege—a luxury available only to those whose bellies are full and whose roofs don't leak?

But this is not merely a book about gloom. Drawing on neuroscience, Buddhist thought, Stoic philosophy, existentialism, and positive psychology, Kriger demonstrates that the antidote to Schopenhauer's pessimism is hidden inside the poison itself. Art, compassion, and a clear-eyed acceptance of suffering can transform the very ideas that threaten to paralyze us into instruments of self-knowledge, creativity, and—against all odds—joy.