The Flash, Season 1

Barry:
My dad has spent 14 years in a six-by-eight foot cell for a crime he didn't commit. I couldn't save my mom, but I can save him.

Joe:
Didn't I promise you that we would get your father out of prison, together?

Barry:
I don't need your help Joe. I can be in and out of there with him before anyone even sees me.

Joe:
Okay, you break him out of there, then what? He's on the run for the rest of his life. Something tells me he's not as fast as you are.

Barry:
You don't know what it's like there.

Joe:
You think I don't understand what you're feeling? I have been a cop for almost as long as you've been alive. So you should know, putting on that suit does not make everybody safe. For every person you save there's going to be someone you can't. And the hardest thing you're going to have to face is not some monster out there with powers. It's gonna be that feeling of uselessness when you can't do anything. Or the guilt that weighs on you when you make a mistake. Some things Barry, you can't fight. Some things, you just have to live with.