If I were to grade emotions,
"Pain" would be on top.

Everything born out of pain, and suffering teaches us how to live,

Happiness and joy are beautiful but they never touch our hearts like pain does,
They never stay as pain does,

All the emotions born out of pain are painful yet beautiful,
Pain would never leave us, but once it's buried and settles somewhere inside,
It stops overpowering other emotions.
The fusion and the blend of new emotions we get is called "becoming strong"

The skill when we find happiness even in pain would be something I'll be looking for