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

yaṁ labdhvā chāparaṁ lābhaṁ manyate nādhikaṁ tataḥ yasmin sthito na duḥkhena guruṇāpi vichālyate

Which, having obtained, he thinketh there is no greater gain beyond it; wherein, established, he is not shaken even by heavy sorrow;

In plain words: Krishna says once someone reaches this state, he knows nothing is worth more. Even a great sorrow cannot shake him.