…And following that train of thought led him back to Earth, back to the quiet hours in the center of the clear water ringed by a bowl of tree-covered hills. That is the Earth, he thought. Not a globe thousands of kilometers around, but a forest with a shining lake, a house hidden at the crest of the hill, high in the trees, a grassy slope leading upward from the water, fish leaping and birds strafing to take the bugs that lived at the border between water and sky. Earth was the constant noise of crickets and winds and birds. And the voice of one girl, who spoke to him out of his far-off childhood. The same voice that had once protected him from terror. The same voice that he would do anything to keep alive, even return to school, even leave Earth behind again for another four or forty or four thousand years.
Ender's Game by Orson Scott Card.