Who said "Slang is a language that rolls up its sleeves."?

This quote is attributed to Carl Sandburg.

Slang is a language that rolls up its sleeves. - Carl Sandburg

"Slang is a language that rolls up its sleeves."

Carl Sandburg

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."