Bhagavad Gita, Chapter 12, Verse 17

He who neither rejoices, nor hates, nor grieves, nor desires, renouncing good and evil, full of devotion, he is dear to Me.

Even good and bad results are treated the same way here, real detachment applied evenly, not selectively.

This devotee isn't described as simply calm, they're shown as having let go of the whole framework of chasing gain and avoiding loss. Real devotion is what's said to replace that entire pattern.