From Season 2, Episode 07 of The Flash
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lyrics
Joe: "What up, Barry?"
Barry: "Zoom destroyed me. He showed everyone in Central City what he could do and that I'm powerless to stop him. They gave me a key to the city, Joe. I'm supposed to be their hero. I'm supposed to be the guy who can protect them from something as evil as that, and I failed. In front of all of them! When they think of The Flash, all they see now is someone not strong enough to protect them."