One reason that challenge brings happiness is that it allows you to expand your self - definition. You become larger. Suddenly you can do yoga or make homemade beer or speak a decent amount of Spanish. Research shows that the more elements make up your identity, the less threatening it is when any one element is threatened.
Gretchen RubinStudies show that aggressively expressing anger doesn't relieve anger but amplifies it. On the other hand, not expressing anger often allows it to disappear without leaving ugly traces.
Gretchen RubinThink about what kind of person you are and shape your habits, and your happiness, to show what's true about you instead of thinking that you can just import the right answer from the outside.
Gretchen Rubin