Two of G. K. Chesterton's most important and well-known works are contained in this volume: Heretics and Orthodoxy. Orthodoxy (1908) is a book by G. K. Chesterton that has become a classic of Christian apologetics. Chesterton considered this book a companion to his other work, Heretics, writing it expressly in response to G. S. Street's criticism of the earlier work, "that he was not going to bother about his theology until I had really stated mine". In the book's preface, Chesterton states the purpose is to "attempt an explanation, not of whether the Christian faith can be believed, but of how he personally has come to believe it." In it, Chesterton presents an original view of Christian religion. He sees it as the answer to natural human needs, the "answer to a riddle" in his own words, and not simply as an arbitrary truth received from somewhere outside the boundaries of human experience. Heretics is a collection of 20 essays by G. K. Chesterton. The topics G. K. Chesterton touches upon range from cosmology to anthropology to soteriology and he argues against French nihilism, German humanism, English utilitarianism, the syncretism of "the vague modern", Social Darwinism, eugenics and the arrogance and misanthropy of the European intelligentsia. Together with Orthodoxy, this book is regarded as central to his corpus of moral theology.