What is the theme in The Sacred Journey; a Memoir of Early Days by Frederick Buechner?

Another theme in the novel is Strength that can be found in weakness. Throughout his life, Freddy is always fascinated by the character of King Rinkitink, the King of the Land of Oz. Freddy loves Rinkitink because the fat little man is so obviously weak, breaking down emotionally, and not much of a fighter, but somehow Rinkitink always manages to win, emerging victorious and ridiculous from a cloud of dust. Other literary characters that remind Freddy of Rinkitink are also his favorites, and when Freddy writes his first novel, the main character is a little fat man inspired by Rinkitink. Freddy notes that he himself is thin and that obesity might be considered a weakness, but he sees the fat more like armor, protecting the wearer from the outside world. At any rate, Rinkitink's fat seems to protect him.