Bhagavad Gita 18.54 Chapter 18, Verse 54

ब्रह्मभूतः प्रसन्नात्मा न शोचति न काङ्क्षति ।
समः सर्वेषु भूतेषु मद्भक्तिं लभते पराम् ॥१८.५४॥

brahmabhūtaḥ prasannātmā na śocati na kāṅkṣati
samaḥ sarveṣu bhūteṣu madbhaktiṃ labhate parām

Meaning

One with Brahman and serene within, such a person neither grieves nor craves. Equal towards all beings, they attain supreme devotion to me.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 18.54 (Chapter 18, Liberation through Renunciation (Moksha Sannyasa Yoga), Verse 54)