He is most renowned as the author of the 1648 publication Imagen de la Virgen María, a description and theological interpretation of an apparition to Juan Diego of the Virgin Mary as Our Lady of Guadalupe which is the first published narrative of the event.
He is best known for his 1648 book, "Imagen de la Virgen María," which provides a detailed description and theological analysis of the apparition of the Virgin Mary to Juan Diego, making it the first published narrative of this event.