Orthodoxy is a passionate defense of the Christian faith written by G. K. Chesterton, combining wit, paradox, and philosophical reflection. Published in 1908, the work presents itself as an intellectual autobiography in which the author recounts his journey toward Christian orthodoxy, challenging both modern skepticism and the intellectual trends of his time. Far from being a conventional theological treatise, Orthodoxy argues that faith is not an irrational imposition but a logical, imaginative, and deeply human response to the fundamental questions of existence. Chesterton sharply explores themes such as reason, imagination, wonder, morality, and the meaning of the universe, claiming that Christianity does not restrict freedom of thought but rather expands it. Through an ironic tone and vibrant prose, he critiques materialism and relativism, asserting that only the Christian worldview reconciles opposites: freedom and law, joy and sacrifice, individuality and community. Since its publication, Orthodoxy has been appreciated by both believers and skeptics for its originality and argumentative strength. Its lasting relevance lies in its ability to invite readers to reconsider modern certainties and to discover an unexpected logic within Christian tradition. In a time of spiritual confusion, Chesterton offers a vision in which dogma becomes a map for exploring the mystery of the world—and of the self.