A successful individual typically sets his next goal somewhat, but not too much, above his last achievement.
"Resolving social conflicts; selected papers on group dynamics" edited by Gertrude W. Lewin New York: Harper & Row, 1948, p. 133; as cited in "Schooling & Capitalism: A Sociological Reader" by Roger Dale, Madeleine MacDonald, Geoff Esland, (p. 111), 1976.
