You can use these sayings for your own signature.
"Be yourself; everyone else is already taken."
"Always believe who you want to be, and don't let it fade."
"Don't be afraid to give up the good to go for the great."
"The difficulties and struggles of today are the price we must pay for accomplishments and victories of tomorrow."
"The ladder of success is best climbed by stepping on the rungs of opportunity."
If you have anymore post them here.