Bhagavad Gita, Chapter 2, Verse 56

He whose mind is not shaken by adversity, who does not long for pleasure, and who is free from attachment, fear, and anger, is truly a sage of steady wisdom.

Steady through hardship, not chasing pleasure, free of clinging, fear, and anger. That's what steady wisdom looks like.

This is Krishna's answer to Arjuna's question about what an enlightened person is like. Not someone who feels nothing, but someone whose emotional weather stops running the show.