Dinah Madani: You don’t believe in justice?

David Lieberman: No, I did. I did. You were it. You and the system. I’ve learned different.

Dinah Madani: Good men have died trying to expose this thing. They believed.

David Lieberman: Well, I believe the only way to get these assholes is to become like them.

Dinah Madani: No, I don’t believe that.

David Lieberman: You will. In the end.

From The Punisher – Season 1 Episode 12: ‘Home’ (1×12)