“There are two kinds of anger: hot and cold. Boys and girls experience both, but as they grow up the anger separates according to the sex. Boys need hot anger to survive. They need inclination to fight, the drive to sink the knife into the flesh, the energy and initiative of fury. It's a requirement of hunting, of defense, of pride. Maybe of sex too. And girls need cold anger. They need the cold simmer, the ceaseless grudge, the talent to avoid forgiveness, the sidestepping of compromise. They need to know when they say something that they will never back down, ever, ever. It's the compensation for a more limited scope in the world. Cross a man and you struggle, one of you wins, you would adjust and go on -- or you lie there dead. Cross a woman and the universe is changed, once again, for cold anger requires an eternal vigilance in all matters of slight and offense.”

“And girls need cold anger. They need the cold simmer, the ceaseless grudge, the talent to avoid forgiveness, the side stepping of compromise. They need to know when they say something that they will never back down, ever, ever.”

“Cross a man and you struggle, one of you wins, you adjust and go on - or you lie there dead. Cross a woman and the universe is changed, once again, for cold anger requires an eternal vigilance in all matters of slight and offense”

“Cold and anger were not a good mix."Hayden," Nick called from behind me.Oh, good! Just what this walk needed: a double-shot of ex to go with that cold and anger.”

“He could see Bonzo's anger growing hot. Hot anger was bad. Ender's anger was cold, and he could use it. Bonzo's was hot, and so it used him. ”

“She watched the sun bleed water out of the icicle. Warm and cold working together to make an icicle. Warm and cold anger working together to make a fury, a fury worthy enough to use as a weapon against the old things that still needed fighting.”