NCIS Season 10 Episode 13

Abby: Have the bad things been outweighing the good things all these years, and I just never noticed?
McGee: What do you mean?
Abby: All I ever wanted was to help people with the truth, and I've done that, but then bad still wins sometimes, and then I just want to file it away like it never happened, so I can go back to being happy.
McGee: There's nothing wrong with that.
Abby: (referring to her first and last cases) Yes, there is, McGee, because then sometimes the Cutwrights and the Dunns they just keep fighting no matter what the truth is, and sometimes-- Ricki never gets to see her grandpa again. If the bad outweighs the good, then that means that I'm not enough.
McGee: Abby, listen to me.
Abby: No, I'm... And if I'm not enough, McGee, then-then why, why even try?