Who said "What doesn't kill you makes you more capable of killing."?

This quote is attributed to Frank Castle.

What doesn't kill you makes you more capable of killing. - Frank Castle

"What doesn't kill you makes you more capable of killing."

Frank Castle Humor

"Punishment is a language they understand."

"I'm not a hero. I'm a tool, sharpened and aimed."

"The only way to stop evil is to be better at it than they are."

"Mercy is for the living. The dead don't care."

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."