Picard: Moby Dick? Lily: Actually, I never read it. Picard: Ahab spent years hunting the white whale that crippled him. A quest for vengeance. But...in the end, it destroyed him... and his ship. Picard: I guess he didn't know when to quit.
After Picard quotes a famous line he cites it as coming from Moby Dick. Lily admits to never having read it. Picard summarizes its plot explaining that his quest for vengance for the whale destroyed him and his ship. Lily replies that she believes that he did not know when to quit.