Orthodoxy by G. K. Chesterton

G.K. Chesterton, one of the most prolific writers of his age, converted to Catholicism in his late 40s, but his devout Christianity and Anglicanism was a defining characteristic for much of his adult life, particularly under the encouragement of his wife Frances. In 1908 Chesterton published one of his most famous works of Christian apologetics, Orthodoxy, though the volume does not aim to legitimize the religion; instead, it describes the spiritual journey of a single man and how he personally came to believe in Christianity, and it does so with a brilliant combination of wit, intelligence and humor.