Ender's game

He’s manipulating me, she thought, but that doesn’t mean he isn’t sincere.

She knew that Peter was calculating even now, but she believed that under the calculations he was telling the truth.

People should be allowed to have as many children as they like, and the surplus population should be sent to other worlds, to spread mankind so far across the galaxy that no disaster, no invasion could ever threaten the human race with annihilation.