Sacrifice for a loved one is not always easy.
In the story, Della sacrifices her most prized possession, her hair, in order to buy her loved one a present for Christmas. This line shows how difficult the sacrifice is for her to make. It is important to understand here that the word sacrifice means that someone is giving something up that is important to them, otherwise it would not be considered a sacrifice. This theme is also shown when Jim has a hard time sacrificing his family heirloom to buy Della her gift.
Answer:
Hallucinations can often be used for <u>foreshadowing</u> (a clue for what is to come in the future), <u>seeing the truth</u>, etc.