The Flash, Season 3

Iris:
I hate that we have to do this. He so badly wanted powers, and now to keep him locked up so he doesn't get them, it's...

Barry:
It's hard, I know.

Iris:
I don't know if you actually do.

Barry:
What does that mean?

Iris:
All Wally wants to do is to help people. And to see you do that every day while all he can do is stand by and watch... it's hard being a bystander sometimes.

Barry:
You don't... feel that way, too, do you?

Iris:
Barry,... c'mon. My contributions here are limited. I don't know science. I don't have powers. I don't know how to help you.

Barry:
I couldn't do this without you.

Iris:
It's not true.

Barry:
That is true. Whether you realize it or not, there is no Flash without Iris West.