i changed the universe.

“When Dad was tucking me in that night and we were
talking about the book, I asked if he could think of a solution to that
problem. “Which problem?” “The problem of how relatively
insignificant we are.” He said, “Well, what would happen if a plane
dropped you in the middle of the Sahara Desert and you picked up a single grain
of sand with tweezers and moved it one millimeter?” I said, “I’d probably
die of dehydration.” He said, “I just mean right then, when you moved that
single grain of sand. What would that mean?” I said, “I dunno,
what?” He said, “think about it.” I thought about it. “I guess
I would have moved a grain of sand.” “Which would mean?” “Which
would mean I moved a grain of sand?” “Which would mean you changed the
Sahara.” “So?” “So? So the Sahara is a vast desert. And it has
existed for million of years. And you changed it!” “That’s
true!” I said, sitting up. “I changed the Sahara!” “Which
means?” he said. “What? Tell me.” “Well, I’m not talking
about moving that one grain of sand one millimeter.” “Yeah?” “If you
hadn’t done it, human history would have been one way…” “Uh-huh?” “but you
did do it, so…?” I stood on the bed, pointed my fingers at the fake stars,
and screamed: “I changed the course of human history!” “That’s
right.” “I changed the universe!”

- Extremely Loud and Incredibly Close.