I've heard that before :)
You sure can't if you don't at least TRY.
Maybe not, but I can't ignore _____.
Well, at least I can sleep at night knowing I'm doing my best to ______.
I'm not trying to change the world, just ______.
Or the more philosophical: Yes, but a pebble thrown into a pond makes large ripples....
That's interesting you think that one person can't change the world. I've found that I really can make a difference. Perhaps you might try it sometime. It feels really good.
Hmmm, what about Gandhi, Martin Luther King, Jr, Thomas Edison, Peggy O'Mara (
), etc, etc.
Or the Margaret Mead quote about never doubt that a small group of concerned people can make a difference, in fact, it's the only thing that ever has....something like that!
Or just smile, shake your head and realize that it's THEIR problem, not yours