One of the brain’s primary survival functions is to manage approach and withdrawal: We tend to move toward things that are pleasurable and away from things that are painful. Pleasure is a rough proxy for the healthy and safe; pain is a rough proxy for the unhealthy and dangerous. But our approach-withdrawal function is too crudely calibrated to navigate the nuanced worlds of modern work and love. The brain gets tangled when it encounters short-term pain that is necessary for long-term gain—that exercising you put off, for instance. And the opposite is also true: Short-term pleasures that
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