Our memory of experiences is shaped more by how they end than by how long they last.

Most happiness frameworks explain the past but don’t map the future clearly.

The "four pairs" approach examines where a present choice is likely to lead.

In the 1990s, the Nobel laureate Daniel Kahneman ran a study on colonoscopy patients. Some had the instrument withdrawn quickly at the end of the procedure, producing a sharp final moment of discomfort. Others had it withdrawn more slowly, extending the procedure but ending on a milder sensation. The latter group rated the overall experience as less unpleasant: They had more total discomfort, and they remembered it better.

This is the peak-end rule: We don’t evaluate experiences by averaging how they felt moment to moment. We judge them by their most intense moment and by how they ended. The duration largely vanishes from our evaluation.

For Edward Perper, a cardiologist who spent 18 years reading more than 1,000 research papers on well-being, the finding raised a more uncomfortable question: If memory of experience is this systematically distorted, what exactly are we optimizing for when we pursue happiness?

Perper explored answers from several traditions, including Freudian therapy, Jungian analysis, Cognitive Behavioral Therapy (CBT), Buddhism and Stoicism. He saw value in each, but argues that they answer different questions: Freudian approaches ask why you do what you do. CBT focuses on changing the thinking patterns that drive behaviour. Buddhism encourages........

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