A successful individual typically sets his next goal somewhat but not too much above his last achievement. In this way he steadily raises his level of aspiration... The unsuccessful individual on the other hand, tends to show one of two reactions: he sets his goal very low, frequently below his past achievement... or he sets his goals far above his abilities.
p. 133 as cited in: Roger Dale, Madeleine MacDonald, Geoff Esland (1976) Schooling & Capitalism: A Sociological Reader. p. 111. - Resolving social conflicts; selected papers on group dynamics, 1948