"All that doesn't kill me makes me stronger." Ok, this one is from Nietzchze, but we've all seen Conan, right?
"A dream,to some.A nightmare to others!!!" Merlin in Excalibur.
"There can be only one." Christopher Lambert, Adrian Paul and co from Higlander.
"Don't make me angry. You won't like me when I'm angry." David Banner in Hulk, the series.
Just too many for me to post...