In this article a novel by Graham Greene entitled Monsignor Quixote is analysed, a book that involves a recreation of the novel by Cervantes. The author of this article employs two concepts from Roman law: authority and power in his analysis. In this work by Greene, authority arises from the books or the book writers, whose reading allows life to keep making sense. In Greene, a strategy of reading known as the sortes virgilianae is found and this allows the characters to get their bearings in the daily difficulties. However, power is described as illiterate, the absence of books and ignoranceEn este artículo se analiza una recreación quijotesca en la novela de Graham Greene Monseñor Quijote. Para ello se utilizan dos términos procedentes del Derecho romano: los conceptos de autoridad y poder. En esta obra de Greene, la autoridad surge de los libros o de autores de libros, cuya lectura permite que la vida siga teniendo sentido. En Greene encontramos la estrategia de lectura conocida como las sortes virgilianae que permite a los personajes orientarse en las dificultades diarias. Sin embargo, el poder está caracterizado por su condición iletrada, la ausencia de libros y su ignorancia.