Lionel Luthor and Lex Luthor in “Unfinished Business”

Lionel Luthor

When your attempt to escape failed, you sabotaged my efforts to have you released, to be cared for at home.

Lex Luthor

But I told you. I'm cured. A cured patient doesn't belong in a hospital.

Lionel Luthor

Oh, it's painful to see you like this. You know I have your best interest at heart, don't you?

Lex Luthor

The only interest you have... is staying out of prison. I'm not insane, and you know it.

Lionel Luthor

It's sad to see a man who's lost his mind. But it's tragic when he's convinced himself that he's sane.