BhG 5.20

syntax

[yaḥ] (he who) sthira-buddhiḥ (with steady intelligence) asaṁmūḍhaḥ (unbewildered) brahma-vit (knowing brahman) brahmaṇi (in brahman) sthitaḥ (situated) [asti] (it is),
[saḥ] (he) priyam (pleasant) prāpya (after obtaining) na prahṛṣyet (he should not rejoice),
apriyaṁ ca (and unpleasant) prāpya (after obtaining) na udvijet (he should not be agitated).

grammar

na	–	av. – not;
prahṛṣyet	–	√hṛṣ (to be excited) Pot. P 1v.1 – he should rejoice;
priyam	–	priya 2n.1 n. – liked, dear, pleasant (from: √prī – to please);
prāpya	–	pra-√āp (to obtain) absol. – after obtaining;
na	–	av. – not;
udvijet	–	ud-√vij (to be agitated, to tremble, to fear) Pot. P 1v.1 – he should tremble, he should be agitated;
prāpya	–	pra-√āp (to obtain) absol. – after obtaining;
ca	–	av. – and;
apriyam	–	a-priya 2n.1 n. – not liked, unpleasant (from: √prī – to please);
sthira-buddhiḥ	–	sthira-buddhi 1n.1 m.; BV: yasya buddiḥ sthirāsti saḥ – whose intelligence is steady (from: √sthā – to stand, sthira – firm, hard, steady; √budh – to wake, to perceive, to understand, buddhi – intelligence, thought, understanding, knowledge, idea, opinion);
asaṁmūḍhaḥ	–	a-saṁ-mūḍha (sam-√muh – to become confused, bewildered, stupefied) PP 1n.1 m. – unbewildered;
brahma-vit	–	brahma-vit 1n.1 m.; yo brahma vetti saḥ – who knows brahman (from: √bṛh – to increase, brahman – spirit, the Vedas; √vid – to know, to understand, -vit – suffix: who knows);
brahmaṇi	–	brahman 7n.1 n. – in spirit, in the Vedas (from: √bṛh – to increase);
sthitaḥ	–	sthita (√sthā – to stand) PP 1n.1 m. – standing, situated;

textual variants

nodvijet → na dveṣti (does not hate);
cāpriyam → vipriyam (unpleasant);
nodvijet prāpya cāpriyam → nāpriyaṁ prāpya codvijet (he should not be agitated after obtaining unpleasant);
sthitaḥ → sthitiḥ / sthitāḥ (position / those situated);

Śāṃkara

yasmāt nirdoṣaṃ samaṃ brahmātmā, tasmāt—

na prahṛṣeyet praharṣaṃ na kuryāt priyam iṣṭāṃ prāpya labdhvā | nodvijet prāpya cāpriyam aniṣṭāṃ labdhvā | deha-mātrātma-darśināṃ hi priyāpriya-prāptī harṣa-viṣādau kurvāte, na kevalātma-darśinaḥ, tasya priyāpriya-prāpty-asaṃbhavāt | kiṃ ca—sarva-bhūteṣv ekaḥ samo nirdoṣa ātmeti sthirā nirvicikitsā buddhir yasya sa sthira-buddhir asaṃmūḍhaḥ saṃmoha-varjitaś ca syāt yathokta-brahmavid brahmaṇi sthito’karma-kṛt sarva-karma-saṃnyāsīty arthaḥ

Rāmānuja

yena prakāreṇāvathitasya karmayoginaḥ samadarśanarūpo jñanavipāko bhavati, taṃ prakāram upadiśati

yādṛśadehasthasya yadavasthasya prācīnakarmavāsanayā yat priyaṃ bhavati, yac cāpriyam, tadubhayaṃ prāpya harṣodvegau na kuryāt / katham? sthirabuddhiḥ sthire ātmani buddhir yasya saḥ sthirabuddhiḥ, asaṃmūḍho asthieṇa śarīreṇa sthiram ātmānam ekīkṛtya mohaḥ saṃmohaḥ; tadrahitaḥ / tac ca katham? brahmavid brahmaṇi sthitaḥ / upadeśena brahmavit san tasmin brahmaṇy abhyāsayuktaḥ / etad uktaṃ bhavati tattvavidām upadeśena ātmayāthātmyavid bhūtvā tatraiva yatamāno dehātmābhimānaṃ parityajya sthirarūpātmāvalokanapriyānubhave vyavasthitaḥ asthire prākṛte priyāpriye prāpya harṣodevegau na kuryād iti

Śrīdhara

brahma-prāptasya lakṣaṇam āha na prahṛṣyed iti | brahma-vid bhūtvā brahmaṇy eva yaḥ sthitaḥ sa priyaṃ prāpya na prahṛṣyet prakṛṣṭa-harṣavān syāt | apriyam prāpya ca nodvijet na viṣīdatīty arthaḥ | yataḥ sthira-buddhir sthirā niścalā buddhir yasya | tat kutaḥ ? yato ‚saṃmūḍho nivṛtta-mohaḥ

Madhusūdana

yasmān nirdoṣaṃ samaṃ brahma tasmāt tad-rūpam ātmānaṃ sākṣātkurvann āha na prahṛṣyed iti | duḥkheṣv anudvigna-manāḥ sukheṣu vigata-spṛhaḥ ity atra vyākhyātaṃ pūrvārdham | jīvan-muktānāṃ svābhāvikaṃ caritam eva mumukṣubhiḥ prayatna-pūrvakam anuṣṭheyam iti vadituṃ liṅga-pratyayau | advitīyātma-darśana-śīlasya vyatirikta-priyāpriya-prāpty-ayogyāc ca tan-nimittau harṣa-viṣādāv ity arthaḥ |

advitīyātma-darśanam eva vivṛṇoti – sthira-buddhiḥ sthirā niścalā saṃnyāsa-pūrvaka-vedānta-vākya-vicāra-paripākeṇa sarva-saṃśaya-śūnyatvena nirvicikitsā niścitā brahmaṇi buddhir yasya sa tathā labdha-śravaṇa-manana-phala iti yāvat | etādṛśasya sarvāsaṃbhāvanā-śūnyatve ‚pi viparīta-bhāva-pratibandhāt sākṣātkāro nodetīti nididhyāsanam āha – asaṃmūḍhaḥ | nididhyāsanasya vijātīya-pratyayānantarita-sajātīya-pratyaya-pravāhasya paripākeṇa viparīta-bhāvanākhya-saṃmoha-rahitaḥ | tataḥ sarva-pratibandhāpagamād brahmavid brahma-sākṣātkāravān | tataś ca samādhi-paripākeṇa nirdoṣe same brahmaṇy eva sthito nānyatreti brahmaṇi sthito jīvan-muktaḥ sthita-prajña ity arthaḥ | etādṛśasya dvaita-darśanābhāvāt praharṣodvegau na bhavata ity ucitam eva | sādhakena tu dvaita-darśane vidyamāne ‚pi viṣaya-doṣa-darśanādinā praharṣa-viṣādau tyājyāv ity abhiprāyaḥ

Viśvanātha

evaṃ laukika-priyāpriyādiṣv api teṣāṃ sāmyam āha na prahṛṣyed iti | na prahṛṣyet na prahṛṣyati | nodvijet nodvijate | sādhana-daśāyām evam abhyased iti vivakṣayā vā liṅ | asaṃmūḍho harṣa-śokādīnām abhimāna-nibandhanatvena saṃmoha-mātratvāt

Baladeva

brahmaṇi sthitasya lakṣaṇam āha neti | vartamāne dehe sthitaḥ prārabdhākṛṣṭaṃ priyam apriyaṃ ca prāpya na prahṛṣyen na codvijet | kutaḥ ? sthirā svātmani buddhir yasya saḥ | asaṃmūḍho ‚nityena dehena nityam ātmānam ekīkṛtya mohaṃ na labdhaḥ | brahmavit tādṛśaṃ brahmānubhavan | evaṃlakṣaṇo brahmaṇi sthito bodhyaḥ