Lena and Rhea in “Unfinished Business”

Lena

[getting emotional] You know, I... just thought if I could make this work, I would prove to the world and... to my mother that I was as good as the Golden Boy. I think most of all, I just wanted to prove it to myself.

Rhea

You don't have to prove anything. You're smarter than Lex. [Lena demurs] No, I'm not saying that to make you feel better. I'm saying it as a scientist. As someone who knows. But you need to stop trying to think like your brother. From what you've told me about Lex, he's a man who's concerned with power. And that's how you've been trying to fix this. Give it more power, you think it will work.

Lena

Yeah, and it just keeps blowing.

Rhea

But you're not a person who's consumed with power, are you? So if you weren't trying to do what Lex would do,... what would you do?

Lena

[considering] I'd... try to find a way to increase the anion input without overloading the energy output, all while maintaining the element's synthesis rate as a constant.

Rhea

Not power. Balance.