Who said "Sometimes doing the right thing means standing alone."?

This quote is attributed to Natasha Romanoff.

Sometimes doing the right thing means standing alone. - Natasha Romanoff

"Sometimes doing the right thing means standing alone."

Natasha Romanoff Courage

"I'm not going to fight you."

"Sometimes the best way to solve your own problems is to help someone else."

"I have a very specific skill set."

"You know, I'm actually a very good liar."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."