Who said "Emotion is a weakness in my profession."?

This quote is attributed to Black Widow / Natasha Romanoff.

Emotion is a weakness in my profession. - Black Widow / Natasha Romanoff

"Emotion is a weakness in my profession."

Black Widow / Natasha Romanoff

"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."