Each person is an idiom unto himself, an apparent violation of the syntax of the species.
Gordon AllportPersonality is and does something...It is what lies behind specific acts and within the individual
Gordon AllportWe cannot know the young child's personality by studying his systems of interest, for his attention is as yet too labile, his reactions impulsive, and interests unformed. From adolescence onward, however, the surest clue to personality is the hierarchy of interests, including the loves and loyalties of adult life.
Gordon Allport