“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. ”

“His anger was as great as mine, but hot where mine was cold.”

“Red-hot anger takes away a lot of the heartache.”

“Fear made you cold. It made you tremble. Anger made you hot. It made you want to hurt someone.”

“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.”

“This was a little house, with a ceiling that kept getting higher and higher, a hot place with no windows. This was anger.”