The last works completed before Nietzsche's final years of insanity, Twilight of the Idols and The Antichrist contain some of his most passionate and polemical writing. Both display his profound understanding of human nature and continue themes developed in The Genealogy of Morals, as the philosopher lashes out at the deceptiveness of modern culture and morality. Twilight of the Idols attacks European society, Christianity, and the works of Socrates and Plato, which he proclaims are life-denying as they prioritize reason over instinct and the after-world over the apparent world. The Antichrist explores the history, psychology, and moral precepts of Christianity, forming his final assault on organized religion.