How we cite our quotes: (Section.Paragraph)
Quote #1
"Don't ask him for anything. Just what's ours. What he should have given me but never did… Make him pay, son, for all those years he put us out of his mind." (1.3)
Dolores makes Juan Preciado promise that he'll go to Comala to get revenge on Pedro for having abandoned them, and thus the novel gets kick-started.
Quote #2
"No," he said, shaking his head emphatically. "I won't give my blessing. He was an evil man, and he shall not enter the Kingdom of Heaven. God will not smile on me if I intercede for him." (13.5)
Father Rentería is too weak to actively take revenge on Miguel for the crimes he committed against his family, so his vengeance is in not pardoning Miguel's soul after he dies.
Quote #3
The death of his father dragged other deaths with it, and in each of them was always the image of that shattered face: one eye mangled, the other staring vengefully.
Pedro remembers his father's cadaver as vengeful—perhaps this image is what spurs him to take revenge on his father's killer. Or maybe he's just sort of a bloodthirsty jerk of all trades.