Smallville, Season 4

Jonathan:
Martha, what exactly is it that you want me to do? You want me to tell our teenage son that we couldn't possibly survive around here without him? What kind of parents would that make us?

Martha:
Honest ones. How many times has he asked be treated like an adult? This decision took a lot of maturity.

Jonathan:
Or guilt. Martha, Clark still feels responsible for my heart problems. I'm not going to allow him to do this out of pity.

Martha:
It's not pity, Jonathan. Clark knows that if he leaves, he can only come back a few times a year. And he doesn't want one of those times to be your funeral.