Those three things — autonomy, complexity, and a connection between effort and reward — are, most people will agree, the three qualities that work has to have if it is to be satisfying.
Every hand and every hour should be devoted to rescue the world from its insanity of guilt, and to assuage the pangs of human hearts with balm and anodyne. To pity distress is but human; to relieve it is Godlike.
