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
The fact that top executives generally have much larger vocabularies than do their subordinates explains why Sheldon's belief, instilled in him during his childhood, that developing a large vocabulary is the way to get to the top in the world of business is completely justified.