"On Narcissism" is an influential psychological work that explores the concept of narcissism, which is characterized by excessive self-love or self-centeredness. The author delves into the origins and development of narcissism, distinguishing between primary narcissism seen in infants who have not yet differentiated themselves from the outside world, and secondary narcissism in adults. The book argues that narcissism is a necessary stage in normal development, but can also be a characteristic of various mental health disorders if it persists into adulthood. The author also introduces the concept of the ego ideal, which plays a critical role in the development of the self and its relations to others.

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