Here are some other poems about happiness:
Naomi Shihab Nye's "So Much Happiness" from April 2016
My "Happiness" from October 2011
"Small Moth," by Sarah Lindsay, from April 2013
And here, from November 2015, is Pablo Neruda on life, and why we shouldn't expect unhappiness to last forever.
Tricia has today's line at the Miss Rumphius Effect.