This short theological book, published in 1908, is one of Chesterton's most abiding and often-read works. It is a sequel to the earlier Heretics (1905), in which he criticized many of the philosophies currently in vogue, and offers a positive "alternative philosophy". Chesterton writes in an autobiographical manner, rather than presenting strict historical or doctrinal formulation and analysis. His 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... It deals first with all the writer's own solitary and sincere speculations and then with all the startling style in which they were all suddenly satisfied by the Christian Theology". It is a short book of nine chapters, written with Chesterton's usual insightful, engaging, and whimsical style.