BhG 15.20

syntax

he anagha (O sinless one!), he bhārata (O descendant of Bhārata!),
iti (thus) mayā (by me) idam guhyatamam śāstram (this most secret teaching) uktam (said) [asti] (it is),
etad (this) buddhvā (after understanding)
buddhimān (who has the intelligence) kṛta-kṛtyaḥ ca (and one by whom what is to be done is done) syāt (he would be).

grammar

iti	–	av. – thus (used to close the quotation);
guhyatamam	–	guhyatama 1n.1 n. – the most secret (from: √xguh – to cover, to hide, PF guhya – to be hidden, secret, mystery; superlative of: guhya – guhya-tara, guhya-tama);
śāstram	–	śāstra 1n.1 n. – order, precept, teaching, scripture (from: √śās – to teach);
idam	–	idam 2n.1 n. – this;
uktam	–	ukta (√vac – to speak) PP 1n.1 n. – spoken, called;
mayā	–	asmat sn. 3n.1 – by me;
anagha	–	an-agha 8n.1 m. – O sinless one (from: agha – evil, sin, suffering);
etat	–	etat sn. 1n.1 n. – this;
buddhvā	–	√budh (to wake, to perceive, to understand) absol. – after knowing;
buddhimān	–	buddhimant 1n.1 m. – who has intelligence (from: √budh – to wake, to perceive, to understand, buddhi – intelligence, thought, understanding, knowledge, idea, opinion; -mant / -vant – suffix denoting one who possesses);
syāt	–	√as (to be) Pot. P 1v.1 – he would be;
kṛta-kṛtyaḥ	–	kṛta-kṛtya 1n.1 m.; BV: yena kṛtaṁ kṛtyam asti saḥ – by whom what is to be done is done (from: √kṛ – to do, PP kṛta – done, made; PF kṛtya – to be done);
ca	–	av. – and;
bhārata	–	bhārata 8n.1 m. – O descendant of Bhārata;

textual variants

guhyatamaṁ → guptatamaṁ (th emost secret);
idam uktaṁ mayānagha → mayā proktaṁ tavānagha (O sinless one, I said to you);
kṛta-kṛtyaś ca → kṛta-kṛtyaṁ ca;

Śāṃkara

asmin adhyāye bhagavat-tattva-jñānaṃ mokṣa-phalam uktvā, atha idānīṃ tat stauti—
iti etad guhyatamaṃ gopyatamam, atyanta-rahasyam ity etat | kiṃ tat ? śāstram | yady api gītākhyaṃ samastaṃ śāstram ucyate, tathāpy ayam evādhyāya iha śāstram ity ucyate stuty-arthaṃ prakaraṇāt | sarvo hi gītā-śāstrārtho’smin adhyāye samāsena uktaḥ | na kevalaṃ gītā-śāstrārtha eva, kiṃtu sarvaś ca vedārtha iha parisamāptaḥ | yas taṃ veda sa veda-vit [gītā 15.1] vedaiś ca sarvair aham eva vedyaḥ [gītā 15.15] iti coktam | idam uktaṃ kathitaṃ mayā he’nagha apāpa ! etac chāstraṃ yathā-darśitārthaṃ buddhvā buddhimān syāt bhavet nānyathā | kṛta-kṛtyaś ca bhārata kṛtaṃ kṛtyaṃ kartavyaṃ yena sa kṛta-kṛtyaḥ | viśiṣṭa-janma-prasūtena brāhmaṇena yat kartavyaṃ tat sarvaṃ bhagavat-tattve vidite kṛtaṃ bhaved ity arthaḥ | na cānyathā kartavyaṃ parisamāpyate kasyacid ity abhiprāyaḥ | sarvaṃ karmākhilaṃ pārtha jñāne parisamāpyate [gītā 4.33] iti coktam |
etad dhi janma-sāmagryaṃ brāhmaṇasya viśeṣataḥ |
prāpyaitat kṛta-kṛtyo hi dvijo bhavati nānyathā || [mātranu 12.93]
iti ca mānavaṃ vacanam | yataḥ etat paramārthatattvaṃ mattaḥ śrutavān asi, ataḥ kṛtārthas tvaṃ bhārateti

Rāmānuja

itthaṃ mama puruṣottamatvapratipādanaṃ sarveṣāṃ guhyānāṃ guhyatamam idaṃ śāstram, „tvam anaghatayā yogyatamaḥ” iti kṛtvā mayā tavoktam / etad buddhvā buddhimāṃs syāt kṛtakṛtyaś ca māṃ prepsunā upādeyā yā buddhiḥ sā sarvā upāttā syāt: yac ca tena kartavyam, tat sarvaṃ kṛtaṃ syād ityarthaḥ / anena ślokena, anantaroktaṃ puruṣottamaviṣayaṃ jñānaṃ śāstrajanyam evaitat sarvaṃ karoti, na tatsākṣātkārarūpam ity ucyate

Śrīdhara

adhyāyārtham upasaṃharati itīti | ity anena saṃkṣepa-prakāreṇa guhyatamam atirahasyaṃ sampūrṇaṃ śāstram eva mayoktam | na tu punar viṃśati-ślokam adhyāya-mātraṃ he anagha vyasana-śūnya | ata etan mad-uktaṃ śāstraṃ buddhyā buddhimān samyag jñānī syaāt | ṛta-kṛtyaś ca syāt | yo ‚pi ko ‚pi he bhārata tvaṃ kṛta-kṛtyo ‚sīti kiṃ vaktavyam iti bhāvaḥ

Madhusūdana

idānīm adhyāyārthaṃ stuvann upasaṃharati itīti | iti anena prakāreṇa guhyatamaṃ rahasyatamaṃ sampūrṇaṃ śāstram eva saṃkṣepeṇedam asminn adhyāye mayoktaṃ he ‚naghāvyasana | etad buddhvānyo ‚pi yaḥ kaścid buddhimān ātma-jñānavān syāt kṛtaṃ sarvaṃ kṛtyaṃ yena na punaḥ kṛtyāntaraṃ yasyāsti sa kṛtakṛtyaś ca syāt | viśiṣṭa-janma-prasūtena brāhmaṇena yat kartavyaṃ tat sarvaṃ bhagavat-tattve vidite kṛtaṃ bhavet na tv anyathā kartavyaṃ parisamāpyate kasyacid ity abhiprāyaḥ | he bhārata tvaṃ tu mahākula-prasūtaḥ svayaṃ ca vyasana-rahita iti kula-guṇena sva-guṇena caitad buddhvā kṛta-kṛtyo bhaviṣyasīti kim u vaktavyam ity abhiprāyaḥ

Viśvanātha

adhyāyārtham upasaṃharati itīti | viṃśatyā ślokair ebhir atirahasyaṃ śāstram eva sampūrṇaṃ mayoktam

Baladeva

athaitad apātreṣv aprakāśyam iti bhāvenāha itīti | ity evaṃ saṃkṣepa-rūpaṃ puruṣottamatva-nirūpakam idaṃ triślokī-śāstraṃ tubhyaṃ parama-bhaktāya mayoktam | he anagha, tvaāpy apātreṣu naitat prakāśyam iti bhāvaḥ | etad buddhvā buddhimān parokṣa-jñānī syāt | kṛtakṛtyo ‚parokṣa-jñānī ceti puruṣottamatva-jñānam abhyarcyate