Who said "I learned that all men are equal."?

This quote is attributed to Carl Sandburg.

I learned that all men are equal. - Carl Sandburg

"I learned that all men are equal."

Carl Sandburg Justice

Poet American 1878–1967

"I am the people—the mob—the crowd—the mass."

"Life is like an onion; you peel off one layer at a time and sometimes you weep."

"Nothing happens unless first we dream."

"I have always been ahead of my time."

"Justice must always prevail."

"You think I'm just some animal?"

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

"Justice is worth fighting for."