Biographer: Arnold' s belief that every offer of assistance on the part of his colleagues was a disguised attempt to make him look inadequate and that no expression of congratulations on his promotion should be taken at face value may seem irrational  In fact, this belief was a consequence of his early experiences with an admired older sister who always made fun of his ambitions and achievements
In light of this explanation, ttherefore, Arnold' s stubborn belief that his colleagues were duplicitous emerges as clearly justified
Studies show that when usually well-behaved children become irritable, they often exhibit symptoms of viral infections the next day. The suspicion, still held by many adults, that misbehavior must always be paid for is thus both explained and justified.