Ender's Game (Ender's Saga, #1)

by Orson Scott Card

It isn’t the world at stake, Ender. Just us. Just humankind. As far as the rest of the biosphere is concerned, we could be wiped out and it would adjust, it would get on with the next step in evolution. But humanity doesn’t want to die. As a species, we have evolved to survive. And the way we do it is by straining and straining and, at last, every few generations, giving birth to genius. The one who invents the wheel. And light. And flight. The one who builds a city, a nation, an empire. Do you understand any of this?”