There are certainly many studies of Saint Francis of Assisi that an interested reader might find and many of them immensely praiseworthy. But in reading G.K. Chesterton on Francis, you get two glories for one: first is an enlightening study of this most beloved of Christian saints and second is Chesterton himself, one of the great Christian writers of the 20th century, who converted to Roman Catholicism in 1922 because, it has been said, "only the Roman Church could produce a St. Francis of Assisi." Published shortly after his conversion, Chesterton wrote this book in part to reclaim Francis for the church.

There are always those who want to claim Francis for their cause, Chesterton recognized, who also fail to understand the spiritual and intellectual ground upon which he stands. Chesterton would return Francis to Christ. As he summarizes, "however wild and romantic his gyrations might appear to many, [Francis] always hung on to reason by one invisible and indestructible hair.... The great saint was sane.... He was not a mere eccentric because he was always turning towards the center and heart of the maze; he took the queerest and most zigzag shortcuts through the wood, but he was always going home."