Richard Matheson said this quote

“ There seemed no answer. He wasn't resigned to anything, he hadn't accepted or adjusted to the life he'd been forced into. Yet here he was, eight months after the plague's last victim, nine since he's spoken to another human being, ten since Virginia had died. Here he was with no future and a virtually hopeless present. Still plodding on.Instinct? Or was he just stupid? Too unimaginative to destroy himself? Why hadn't he done it in the beginning when he was in the very depths? What had impelled him to enclose the house, install a freezer, a generator, an electric stove, a water tank, build a hothouse, a workbench, burn down the houses on each side of his, collect records and books and mountains of canned supplies, even - it was fantastic when you thought about it - even put a fancy mural on the wall?Was the life force something more than words, a tangible, mind-controlling potency? Was nature somehow, in him, maintaining its spark against its own encroachments?He closed his eyes. Why think, why reason? There was no answer. His continuance was an accident and an attendant bovinity. He was just too dumb to end it all, and that was about the size of it. ”