happiness becomes dysfunctional when you set yourself up as needing to be happy, no matter what. The Turkish-British authors suggest that people thwart their own ability to be happy by placing “excessive standards on themselves to attain happiness.”
Key to their analysis of what you might consider the happiness paradox is that problems begin when you let “should, ought, and must” enter into your need to put yourself in a good mood.
To sum up, there are situations in life you can fix and those you can’t. Feeling convinced that changing your mood is the only way to be well-adapted might very well take you off the road to fulfillment and onto the path of dysfunctional thinking.