Who said "The unforgivable sin is to leave people thinking."?

This quote is attributed to Robert Frost.

The unforgivable sin is to leave people thinking. - Robert Frost

"The unforgivable sin is to leave people thinking."

Robert Frost Education

Poet American 1874–1963

"Two roads diverged in a wood, and I took the one less traveled by."

"The only way out is through."

"Good fences make good neighbors."

"Fire and Ice."

"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."