Who said "I stand for those who can't stand for themselves."?

This quote is attributed to Captain America / Steve Rogers.

I stand for those who can't stand for themselves. - Captain America / Steve Rogers

"I stand for those who can't stand for themselves."

Captain America / Steve Rogers Justice

"I can do this all day."

"There are men laying down their lives. I got no right to do any less than them."

"I'm not gonna fight you."

"I found someone worth fighting for."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."