In Bless Me Ultima. What was the significance of Antonio's Dream in Chapter 9

That night, Antonio has another dream. His brothers lead him to Rosie’s brothel and beckon for him to enter with them. Antonio refuses to enter; if he is to be a priest, he must remain innocent of these sins. Antonio begs his brothers not to enter the house of sin, but Eugene and Leon both ignore him and enter. Andrew laughs at Antonio and promises that he will not enter until Antonio has lost his innocence. Antonio hears the voices of his mother and the priest exclaiming that innocence disappears with knowledge. Accompanied by a bolt of lightning, the figure of Ultima appears in the dream and declares that Antonio’s innocence lies in the lonely winds of the llano.