Bhagavad Gita, Chapter 5, Verse 23

He who can withstand in this world, before the liberation from the body, the impulse arising from lust and anger, he is steadfast in Yoga, he is a happy man.

Real happiness, here, belongs specifically to whoever can actually hold desire and anger in check while still alive.

This sets a real, concrete bar. Not someone who avoided difficult feelings entirely, but someone who genuinely learned to manage them while still in the middle of an ordinary life, that's who this verse calls truly happy.