When did John Dewey say Education is not preparation for life education itself?

John Dewey never said the exact phrase "Education is not preparation for life; education is life itself." While the sentiment is very much in line with his philosophy, that specific wording isn't found in his writings. The idea that education is a process of living and growing, not simply a means to a future end, is a core tenet of his work, expressed in various ways throughout his many books and articles. There's no single, pinpointable quote containing that precise phrasing.