The fact that people often come to love the things that they had to sacrifice much to obtain illustrates the effects of:

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This phenomenon is an example of cognitive dissonance, which refers to the discomfort that arises from holding two contradictory beliefs or values. In this case, a person may have initially felt some discomfort or regret over the sacrifices they had to make to obtain something, but over time they come to rationalize that the sacrifices were necessary and that the thing they gained was worth it. This reduces the cognitive dissonance and leads to greater affection for the thing gained.

The Fact That People Often Come to Love the Things