Smallville, Season 2

Lex:
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:
I'm not gonna let Ryan down.

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