Fluttershy, Zephyr Breeze and others in “Unfinished Business”

Fluttershy

Zephyr, you're smart and talented. You could do anything if you just tried!

Zephyr Breeze

And what if I give everything I have and still fail? Honestly, I think it's better not to try at all.

Rainbow Dash

But then you won't ever do anything.

Zephyr Breeze

I don't expect you two to understand. I mean, when have you ever failed? You've literally helped save Equestria, like, a dozen times.

Fluttershy

And I was worried that I'd fail every time! Sometimes you have to do things, even though you might fail