Who said "Education is the key that opens every door."?

This quote is attributed to Carl Sandburg.

Education is the key that opens every door. - Carl Sandburg

"Education is the key that opens every door."

Carl Sandburg Education

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."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."