The Flash, Season 3

Cisco:
I've been trying this whole time to get you to do this one thing for me. But you kept saying "No, Cisco." "I can't, Cisco." "I would never do that, Cisco." And now you're telling me you went and did it for yourself.

Barry:
Were you listening? It went bad, it went really bad.

Cisco:
I don't care! At least I'd have my brother back.

Barry:
Yeah, you would have him back. But, because of it, somebody might have something happen to them that's just as awful as what happened to Dante, and trust me, you don't want that on your conscience. It's a heavy burden to bear. And I don't know how many times I've said this, but... I'm really sorry about Dante, man.

Cisco:
"Sorry" doesn't change anything.

Barry:
No, it doesn't. But I can't go back. I can't change it. All I can do is move forward. I really hope you can, too.