Who said "I've seen too much to ever go back to who I was."?

This quote is attributed to Captain America (Age of Ultron).

I've seen too much to ever go back to who I was. - Captain America (Age of Ultron)

"I've seen too much to ever go back to who I was."

Captain America (Age of Ultron) Wisdom

"I'm always angry."

"The world is in our hands now."

"We may not be able to save everyone, but we have to try."

"I can do this all day."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."