According to Melanie Klein,notions of good and bad,and right and wrong come from:

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Melanie Klein believed that a child's early experiences with their mother's breast during the oral stage of development shape their sense of good and bad. Specifically, the breast can represent both a source of nourishment and love as well as frustration and anger if it is not immediately available. This creates a dichotomy in the child's mind between "good" and "bad," which serves as a foundation for the development of later moral and ethical values.

According to Melanie Klein,notions of Good and Bad,and Right and Wrong