Sarah's character exemplifies the Freudian component of ego.
The psychoanalytic theory of personality developed by Sigmund Freud states that personality is composed of three components. Id, ego, and superego—these three components of personality—interact to shape complex human behavior. The only aspect of personality that is present from birth is the id.
Sigmund Freud, also known as Sigismund Schlomo Freud, was an Austrian neurologist and the father of psychoanalysis. He lived from 6 May 1856 to 23 September 1939. A patient and a psychoanalyst will converse in order to diagnose and treat illnesses that are thought to be the outcome of psychiatric conflicts. This process is known as psychoanalysis.
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