From Season 2, Episode 01 of The Flash
--------------------
lyrics
Joe: "You want me to tell you that it wasn't your fault? I can't. It was. Guess what? You weren't the only person making decisions that day. All of the rest of us were there too. So stop with this hogging all the blame and regret. We gotta live with it. Move on.
Barry: "What do I do now?"
Joe: "Well, I know that you've been rebuilding Central City at night. It's just bricks and paint. Maybe you should start trying to rebuild... things that really matter."