The Ball and the Cross is a novel by G. K. Chesterton. The title refers to a more worldly and rationalist worldview, represented by a ball or sphere, and the cross representing Christianity. The first chapters of the book were serialized from 1905 to 1906[1] with the completed work published in 1909. The novel's beginning involves debates about rationalism and religion between a Professor Lucifer and a monk named Michael. A part of this section was quoted in Pope John Paul I's Illustrissimi letter to G. K. Chesterton.[2] Much of the rest of the book concerns the dueling, figurative and somewhat more literal, of a Jacobite Catholic named Maclan and an atheist Socialist named Turnbull.[3] Lynette Hunter has argued that the novel is more sympathetic to Maclan, but does indicate Maclan is also presented as in some ways too extreme.[4] Turnbull, as well, is presented in a sympathetic light: both duelists are ready to fight for and die for their antagonistic opinions and, in doing so, develop a certain partnership that evolves into a friendship. The real antagonist is the world outside, which desperately tries to prevent from happening a duel over "mere religion" (a subject both duelists judge of utmost importance).