Who said "The only way out is through, and sometimes there is no out."?

This quote is attributed to Black Widow / Natasha Romanoff.

The only way out is through, and sometimes there is no out. - Black Widow / Natasha Romanoff

"The only way out is through, and sometimes there is no out."

Black Widow / Natasha Romanoff Perseverance

"I used to have nothing. Then I got this job, this team. It's all I have."

"Compromise where you can. Where you can't, don't."

"I'm always picking up after you boys."

"The world doesn't change without sacrifice."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."