Chapter 6 · The Yoga of Meditation · Krishna said
Bhagavad Gita 6.22 — The greatest gain
यं लब्ध्वा चापरं लाभं मन्यते नाधिकं ततः। यस्मिन्स्थितो न दुःखेन गुरुणापि विचाल्यते ॥
yaṃ labdhvā cāparaṃ lābhaṃ manyate nādhikaṃ tataḥ | yasminsthito na duḥkhena guruṇāpi vicālyate ||
Meaning
— having gained which he thinks no other gain greater, and established in which he is not shaken even by the heaviest sorrow —