Who said "I've learned that change is the only constant."?

This quote is attributed to Natasha Romanoff (Civil War).

I've learned that change is the only constant. - Natasha Romanoff (Civil War)

"I've learned that change is the only constant."

Natasha Romanoff (Civil War) Change

"Sometimes I see the mission the same way you do."

"We've made mistakes. But we're still a family."

"I know this job. We both do."

"When you can live with it, let me know."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."