Who said "We have to fight. That's what we do."?

This quote is attributed to Rick Grimes.

We have to fight. That's what we do. - Rick Grimes

"We have to fight. That's what we do."

Rick Grimes Courage

"We are the walking dead."

"This is not a democracy anymore."

"We don't kill the living."

"I'm not the same man I was before."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."