Absolutely, especially if the harm was intentional (on purpose). If you harm someone, you have to think about and live with that incident for the rest of your life. Ill will and feelings eat away at a person. You start to lose sleep; your health declines in many ways; overall, you just feel terrible. This is all multiplied even more when you intentional harm someone. Often times, you relive the incident over and over again. The harm being done to you, now, can be far worse than when you placed harm on someone else.
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The repetition of the phrase “Never shall I forget” illustrates how Eliezer's experiences are forever burned into his mind; like the actual experiences, the memories of them are inescapable. I am not sure how to explain the internal conflit faced by the narrator. I know for sure that the guys from my fav site PrimeWritings. They know how to analyze it i the proper way