One whose mind is not disturbed in pain, who does not crave pleasure, free from attachment, fear and anger — that sage is said to have a steady mind.

Kṛṣṇa continues describing the sthita-prajña with specific characteristics:

Duḥkheṣu anudvigna-manāḥ — mind not disturbed in pains. Udvigna is agitation, anxiety. The sage is not insensitive to pain but doesn’t lose their center.

Sukheṣu vigata-spṛhaḥ — without craving for pleasures. Spṛhā is intense desire, greed. They can enjoy pleasure without clinging.

Vīta-rāga-bhaya-krodhaḥ — free from:

• Rāga — attachment, compulsive attraction
• Bhaya — fear
• Krodha — anger

These three (rāga, bhaya, krodha) are the basic emotional reactions: we want what’s pleasant, fear what’s unpleasant, become enraged when we don’t get what we want.

Muni — the sage, literally “the silent one.” Wisdom is associated with inner silence.

This verse paints a portrait of profound emotional balance, not artificial suppression.