Sigmund Freud was an Austrian neurologist as well as being the founder of the study known as Psychoanalysis. Based on Freud's studies as well as information provided within this question it can be said that Marcy's superego is what is making her feel this way.
SuperEgo is one of Freud's structural model of the psyche, which is defined as the part of personality made up of ideas or traits that were learned from our parents as well as the society.
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It’s important to know how things worked before, so then if we know how they work, we could change it or leave it the way it is. Sometimes what worked back then doesn’t work now.
