B.G 12.16-19
anapekṣaḥ śucir dakṣaḥ udāsīno gatavyathaḥ। sarvārambhaparityāgī yo madbhaktaḥ sa me priyaḥ ॥16॥
He who is indifferent, pure, skilful, neutral, free from distress, and a renouncer of all undertakings, such a devotee of mine, is dear to Me.
yo na hṛṣyati na dveṣṭi na śocati na kāṅkṣati। śubhāśubhaparityāgī bhaktimān yaḥ sa me priyaḥ ॥17॥
He who neither rejoices nor hates, neither grieves nor desires, who has renounced both good and evil actions, and is full of devotion, is dear to Me.
samaḥ śatrau ca mitre ca tathā mānāpamānayoḥ। śītoṣṇasukhaduḥkheṣu samaḥ saṅgavivarjitaḥ ॥18॥
One who is equal towards both enemies and friends, who remains the same in honour and dishonour, and who is unaffected by cold, heat, happiness, and sorrow, is free from attachment.
tulyanindāstunirmauṇī santuṣṭo yena kenacit। aniketaḥ sthiramatirbhaktimān me priyo naraḥ ॥19॥
A person who is equal in criticism and praise, silent, content with anything, homeless, steady-minded, and devoted is dear to me.
Gīta Bhāshya 12.16-19
Earlier it was said "those who dedicate all their actions to Me" (12.6), those actions are elaborated specifically in 16-19 verses. Special emphasis is provided to practice of devotion (bhaktyabhyāsaḥ).
"sarvārambhaparityāgī", "śubhāśubhaparityāgī" ityādeḥ sāmānyaviśeṣa- vyākhyānavyākhyeyabhāvena apunaruktiḥ. harṣādibhiḥ muktaḥ ityukte kādācitkamapi bhavati iti "yo na hṛṣyati" ityuktam. upacāraparihārārthaṃ pūrvam. ādhikyajñāpanārthaṃ bhaktyabhyāsaḥ. "ye tu sarvāṇi karmāṇi" ityādeḥ prapañca eṣaḥ ॥16-19॥
The phrases "Renouncer of all undertakings" (sarvārambhaparityāgī), "renouncer of good and bad" (śubhāśubhaparityāgī) and so on are used in general and particular context and do not amount to repetition. Based on the previous explanation, one may get doubt - "Pleasure and others to be reduced for some time". So, to definitively conclude, the phrase "who does not rejoice" is used. Not to be undermined, and for the purpose of emphasizing "practice of devotion" is again recommended. Earlier it was said "those who dedicate all their actions" (12.6), those actions are elaborated here.
