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Our current cultural ethos is that achieving happiness is like achieving other goals. If we simply work hard at it, we can master happiness, just as we can figure out how to use new computer software, play the piano or learn Spanish. However, if the goal of becoming happier is different from these other goals, efforts devoted to augmenting happiness may backfire, disappointing -and potentially depressing- us because we can't achieve our expected goal.
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Jonathan Rottenberg (The Depths: The Evolutionary Origins of the Depression Epidemic)