My favorite has got to be "suck it up"
Also another was a G.I. Jane Fan, she used to use this quote but she summed it up a bit more than the original:
"Pain is your friend, your ally, it will tell you when you are seriously injured, it will keep you awake and angry, and remind you to finish the job and get the hell home. But you know the best thing about pain? It lets you know you're not dead yet!"
She was a bit of a sicko to say the least...
I loved her.