Who said "I've learned that patience is its own kind of strength."?

This quote is attributed to Supergirl.

I've learned that patience is its own kind of strength. - Supergirl

"I've learned that patience is its own kind of strength."

Supergirl Patience

"I'm not just Kara Danvers. I'm also Supergirl."

"Being a hero isn't just about having powers. It's about what you choose to do with them."

"I have to believe that there's good in people, even when they give me reason not to."

"My family is what makes me strong."

"Patience is a virtue I'm still learning."

"I may be a redhead, but I'm not a hothead."

"Patience is a virtue."

"Patience is a virtue I never learned."