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 attemp...