Like all the OP's ones.
My best friend is a bugger for one-liners, mainly from films i guess, but one of his faves is:
"Get knocked down 7 times, get up 8!"......never really understood it myself.
Others i like;
"Better to die on your feet, than to live life on your knees"
"Better to burn out than to fade away"
Anyone who's read David Gemmell's "Druss" books will surely know about his 'Code of Iron'.
I've recited it to my son a few times (although very slightly edited).
On an advisory note:
"Never argue with an idiot. They will drag you down to their level, and beat you with experience!"