Bhagavad Gita Chapter 12, Verse 18

समः शत्रौ च मित्रे च तथा मानापमानयोः | शीतोष्णसुखदुःखेषु समः सङ्गविवर्जितः ||

samaḥ śatrau ca mitre ca tathā mānāpamānayoḥ śītoṣṇa-sukha-duḥkheṣu samaḥ saṅga-vivarjitaḥ

One who is equal to friend and foe, equal in honor and dishonor, equal in cold and heat, equal in pleasure and pain, and free from attachment—

Krishna continues describing the qualities of devotees, emphasizing perfect equanimity in all circumstances. 'Samaḥ śatrau ca mitre ca'—equal (samaḥ) to enemy (śatrau) and friend (mitre). 'Tathā mānāpamānayoḥ'—likewise (tathā) in honor and dishonor (māna-apamānayoḥ). 'Śītoṣṇa-sukha-duḥkheṣu samaḥ'—equal (samaḥ) in cold and heat (śīta-uṣṇa), in pleasure and pain (sukha-duḥkheṣu). 'Saṅga-vivarjitaḥ'—free from attachment (saṅga-vivarjitaḥ). This verse describes perfect equanimity: the devotee treats friend and foe equally, remains steady in honor and dishonor, is unaffected by physical conditions (cold and heat) and emotional states (pleasure and pain), and is free from attachment. This is the natural result of devotion: when you're devoted, you naturally become steady in all circumstances. The verse continues into verse 12.19, which will complete the description.