Who said "I've learned that mercy can get you killed."?

This quote is attributed to Andrea.

I've learned that mercy can get you killed. - Andrea

"I've learned that mercy can get you killed."

Andrea

"We're not just surviving anymore. We're actually living."

"I've learned that the dead don't stay dead in this world."

"You have to have hope. Without it, what's the point?"

"I'm not the same person I was before. None of us are."