can't say I ever gave much thought to happiness. I come from a family where happiness was seen as an "extra," a kind of frill to life -- nice to have, but certainly not necessary and by no means paramount. Work was king. Suffering meant you were working hard. It made you worthy.
Paradoxically strong self-esteem also enables us stay open to hearing others' differing views, I believe. This path towards a positive and resilient outlook begins with giving oneself the permission to feel.