“All of life is a constant education.”

Source: Conversations with God: An Uncommon Dialogue, Book 1

Zire Notes (May 2004 - December 2006)

This is a paraphrase of an idea that Dewey expressed using other words in My Pedagogic Creed (1897) and Democracy and Education (1916); it is widely misattributed to Dewey as a quotation.
Cf. James William Norman, A Comparison of Tendencies in Secondary Education in England and the United States (New York: Teachers College, Columbia University, 1922), [//books.google.com/books?id=qrmgAAAAMAAJ&pg=PA140 p. 140] (emphasis added): "...there has for years been a strong and growing tendency in the United States under the leadership of Dewey, and more recently of Kilpatrick, to find an educational method correlative of democracy in society with the belief that education is life itself rather than a mere preparation for life, and that practice in democratic living is the best preparation for democracy."
Misattributed
Variant: Education is a social process; education is growth; education is not preparation for life but is life itself.

Leçons sur les Phénomènes de la Vie Communs aux Animaux et aux Végétaux.

Education for All People and Education for Life