Bhagavad Gita 6.22 Chapter 6, Verse 22

यं लब्ध्वा चापरं लाभं मन्यते नाधिकं ततः ।
यस्मिन्स्थितो न दुःखेन गुरुणापि विचाल्यते ॥६.२२॥

yaṃ labdhvā cāparaṃ lābhaṃ manyate nādhikaṃ tataḥ
yasminsthito na duḥkhena guruṇāpi vicālyate

Meaning

having gained which one thinks there is no greater gain, and established in which one is not shaken even by the heaviest sorrow —

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 6.22 (Chapter 6, The Yoga of Meditation (Atma Samyama Yoga), Verse 22)