A couple more I thought of;
"When you can't run, you crawl. And when you can't crawl, when you can't do that, you find someone to carry you." - Firefly
"When the people we love are taken from us, the way to have them live on is to never stop loving them. Buildings burn, people die but real love is forever." - The Crow)
And another from The Crow - "It can't rain all the time."
"An optimist and a pessimist are sitting at a bar and the pessimist says 'things can't get any worse' and the optimist says 'oh yes they can'" - Toby, West Wing.