Lex Luthor and Clark Kent in “Unfinished Business”

Lex Luthor

Clark, I understand what you're going through, but sometimes, no matter how much you want to save someone, there's nothing you can do.

Clark Kent

I'm not gonna let Ryan down.

Lex Luthor

When my mother got sick, I spent all my time researching the best doctors and treatments. The most important thing I could've done was spend time with her. By the time I realized that, it was too late. I wasn't at her side when she passed, Clark. Don't make the same mistake I did.

Clark Kent

I'm not going to let him die, Lex.