BhG 4.12

syntax

karmaṇām (of activities) siddhim (perfection) kāṅkṣantaḥ (who are desiring)
iha (here) devatāḥ (to divinities) yajante (they offer in sacrifice).
mānuṣe loke (in the human world) karma-jā (born of activity) siddhiḥ (perfection) kṣipram hi (quickly indeed) bhavati (there is).

grammar

kāṅkṣantaḥ	–	kāṅkṣant (√kāṅkṣ – to desire, to expect) PPr 1n.3 m. – who are desiring;
karmaṇām	–	karman 6n.3 n. – of activities (from: √kṛ – to do);
siddhim	–	siddhi 2n.1 f. – accomplishment, fulfilment, perfection, success (from: √sidh – to succeed, to become perfect);
yajante	–	√yaj (to consecrate, to sacrifice, to worship) Praes. Ā 1v.3 – they worship, they offer in sacrifice;
iha	–	av. – here (often meaning: in this world);
devatāḥ	–	devatā 2n.3 f. – divinities (from: √div – to shine, to play, deva – god, divinity);
kṣipram	–	av. – quickly, immediately (from: kṣipra – quick);
hi	–	av. – because, just, indeed, surely;
mānuṣe	–	mānuṣa 7n.1 m. – in human (from: √man – to think, manu – a man, a person);
loke	–	loka 7n.1 m. – in the world;
siddhiḥ	–	siddhi 1n.1 f. – accomplishment, fulfilment, perfection, success (from: √sidh – to succeed, to become perfect);
bhavati	–	√bhū (to be) Praes. P 1v.1 – there is;
karma-jā	–	karma-ja 1n.1 f. – born from activity (from: √kṛ – to do, karman – activity and its result; √jan – to be born, –ja – suffix: born);

textual variants

karmaṇāṃ → karmaṇaḥ / paramāṃ (of activity / supreme);
iha → iti (thus);

Śāṃkara

yadi taveśvarasya rāgādi-doṣābhāvāt sarva-prāṇiṣv anujighṛkṣāyāṃ tulyāyāṃ sarva-phala-pradāna-samarthe ca tvayi sati vāsudevaḥ sarvaṃ [gītā 7.19] iti jñānenaiva mumukṣavaḥ santaḥ kasmāt tvām eva sarve na pratipadyante ? iti śṛṇu tatra kāraṇaṃ—

kāṅkṣanto’bhīpsantaḥ karmaṇāṃ siddhiṃ phala-niṣpattiṃ prārthayanto yajanta ihāsmin loke devatā indrādgny-ādyāḥ | atha yo’nyāṃ devatām upāste’nyo’sāv anyo’ham asmīti na sa veda, yathā paśuḥ | evaṃ sa devānāṃ [bhāvātmauttaṃ 1.4.10] iti śruteḥ | teṣāṃ hi bhinna-devatāyājināṃ phalākāṅkṣiṇāṃ kṣipraṃ śīghraṃ hi yasmān mānuṣe loke | manuṣya-loke hi śāstrādhikāraḥ | kṣipraṃ hi mānuṣe loke iti viśeṣaṇāt | anyeṣv api karma-phala-siddhiṃ darśayati bhagavān | mānuṣe loke varṇāśramādi-karmādhikāra iti viśeṣaḥ | teṣāṃ ca varṇāśramādhikāriṇāṃ karmiṇāṃ phala-siddhiḥ kṣipraṃ bhavati karmajā karmaṇo jātā

Rāmānuja

idānīṃ prāsaṅgikaṃ parisamāpya prakṛtasya karmayogasya jñānākāratāprakāraṃ vaktuṃ tathāvidhakarmayogādhikāriṇo durlabhatvam āha

sarva eva puruṣāḥ karmaṇāṃ phalaṃ kāṅkṣamāṇāḥ indrādidevatāmātraṃ yajante ārādhayanti, na tu kaścid anabhisaṃhitaphalaḥ indrādidevatātmabhūtaṃ sarvayajñānāṃ bhoktāraṃ māṃ yajate / kuta etat? yataḥ kṣiprasminn eva mānuṣe loke karmajā putrapaśvannādysiddhir bhavati / manuṣyalokaśabdaḥ svargādīnām api pradarśanārthaḥ / sarvaṃ eva laukikāḥ puruṣā akṣīṇānādikālapravṛttānantapāpasaṃcayatayā avivekinaḥ kṣipraphalākāṅkṣiṇaḥ putrapaśvannādyasvargādyarthatayā sarvāṇi karmāṇīndrādidevatārādhanamātrāṇi kurvate; na tu kaścit saṃsārodvignahṛdayo mumukṣuḥ uktalakṣaṇaṃ karmayogaṃ madārādhanabhūtam ārabhata ityarthaḥ

Śrīdhara

tarhi mokṣārtham eva kim iti sarve tvāṃ na bhajantīti | ata āha kāṅkṣanta iti | karmaṇāṃ siddhiṃ karma-phalaṃ kāṅkṣantaḥ prāyeneha mānuṣya-loke indrādi-devatā eva yajante | na tu sākṣān mām eva | hi yasmāt karmajā siddhiḥ karmajaṃ phalaṃ śīghraṃ bhavati | na tu jñāna-phalaṃ kaivalyaṃ, duṣprāpyatvāj jñānasya

Madhusūdana

nanu tvām eva bhagavantaṃ vāsudevaṃ kim iti sarve na prapadyanta iti tatrāha kāṅkṣanta iti | karmaṇāṃ siddhiṃ phala-niṣpattiṃ kāṅkṣanta iha loke devatā devān indrāgny-ādyān yajante pūjayanti ajñāna-pratihatatvān na tu niṣkāmāḥ santo māṃ bhagavantaṃ vāsudevam iti śeṣaḥ | kasmāt ? hi yasmād indrādi-devatā-yājināṃ tat-phala-kāṅkṣiṇāṃ karmajā siddhiḥ karma-janyaṃ phalaṃ kṣipraṃ śīghram eva bhavati mānuṣe loke | jñāna-phalaṃ tv antaḥkaraṇa-śuddhi-sāpekṣatvān na kṣipraṃ bhavati |

mānuṣe loke karma-phalaṃ śīghraṃ bhavatīti viśeṣaṇād anya-loke ‚pi varṇāśrama-dharma-vyatirikta-karma-phala-siddhir bhagavatā sūcitā | yatas tat tat kṣudra-phala-siddhy-arthaṃ sa-kāmā mokṣa-vimukhā anyā devatā yajante ‚to na mumukṣava iva māṃ vāsudevaṃ sākṣāt te prapadyanta ity arthaḥ

Viśvanātha

tatrāpi manuṣyeṣu madhye kāminas tu mama sākṣād-bhūtam api bhakti-mārgaṃ parihāya śīghra-phala-sādhakaṃ karma-vartmaivānuvartanta ity āha kāṅkṣanta iti | karmajā siddhiḥ svargādimayī

Baladeva

evaṃ prāsaṅgikaṃ procya prakṛtasya niṣkāma-karmaṇo jñānākāratvaṃ vadiṣyaṃs tad anuṣṭhātuṃ viralatvam āha kāṅkṣanta iti | iha loke ‚nādi-bhoga-vāsanā-niyantritāḥ prāṇinaḥ karmaṇāṃ siddhiṃ paśuputrādi-phala-niṣpattiṃ kāṅkṣanto ‚nityālpa-dān apīndrādi-devān yajante sakāmaiḥ karmabhir na tu sarva-deveśvaraṃ nityānanda-phala-pradam api māṃ niṣkāmais tair yajante | hi yasmād asmin mānuṣe loke karmajā siddhiḥ kṣipraṃ bhavati | niṣkāma-karmārādhitān matto jñānato mokṣa-lakṣaṇā siddhis tu cireṇaiva bhavatīti | sarve lokā bhoga-vāsanā-grasta-sad-asad-vivekāḥ śīghra-bhogecchavas tad-arthaṃ mad-bhṛtyān devān bhajanti | na tu kaścit sad-asad-vivekī saṃsāra-duḥkha-vitrasta-duḥkha-nivṛttaye niṣkāma-karmabhiḥ sarva-deveśaṃ māṃ bhajatīti viralas tad-adhikārīti bhāvaḥ