The science of psychology has been far more successful on the negative than on the positive side; it has revealed to us much about man's shortcomings, his illnesses, his sins, but little about his potentialities, his virtues, his achievable aspirations, or his psychological height. It is as if psychology had voluntarily restricted itself to only half its rightful jurisdiction, and that the darker, meaner half.

Future visions: the unpublished papers of Abraham Maslow (ed. Sage Publications, Inc, 1996) - ISBN: 9780761900504