योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-53, verse-17

शान्तब्रह्मवपुर्भूत्वा कर्म ब्रह्ममयं कुरु ।
ब्रह्मार्पणसमाचारो ब्रह्मैव भवसि क्षणात् ॥ १७ ॥

śāntabrahmavapurbhūtvā karma brahmamayaṃ kuru ,
brahmārpaṇasamācāro brahmaiva bhavasi kṣaṇāt 17

17. śānta-brahma-vapuḥ bhūtvā karma brahma-mayam kuru
brahma-arpaṇa-samācāraḥ brahma eva bhavasi kṣaṇāt

17. śānta-brahma-vapuḥ bhūtvā brahma-mayam karma kuru
brahma-arpaṇa-samācāraḥ kṣaṇāt brahma eva bhavasi

17. Having become tranquil and identifying your very being with Brahman (brahman), perform all actions (karma) as pervaded by Brahman (brahman). With your conduct characterized by offering everything to Brahman (brahman), you indeed become Brahman (brahman) in an instant.

Words meanings summery:

• शान्त-ब्रह्म-वपुः (śānta-brahma-vapuḥ) - identifying your very being with tranquil Brahman (brahman) (one whose form is tranquil Brahman)

• भूत्वा (bhūtvā) - having become

• कर्म (karma) - action, duty

• ब्रह्म-मयम् (brahma-mayam) - as Brahman (brahman)-pervaded (consisting of Brahman, pervaded by Brahman)

• कुरु (kuru) - do, perform

• ब्रह्म-अर्पण-समाचारः (brahma-arpaṇa-samācāraḥ) - with your conduct characterized by offering everything to Brahman (brahman) (one whose conduct is offering to Brahman)

• ब्रह्म (brahma) - Brahman

• एव (eva) - indeed, only, just

• भवसि (bhavasi) - you become, you are

• क्षणात् (kṣaṇāt) - instantly, in a moment, from a moment

Words meanings and morphology

शान्त-ब्रह्म-वपुः (śānta-brahma-vapuḥ) - identifying your very being with tranquil Brahman (brahman) (one whose form is tranquil Brahman)

(adjective)

Nominative, masculine, singular of śāntabrahmavapus

śāntabrahmavapus - one whose body/form is tranquil Brahman

Compound type : bahuvrīhi (śānta+brahman+vapus)

• śānta – tranquil, calm, peaceful
  adjective (masculine)
  Past Passive Participle
  from root `śam`
  Root: śam (class 4)
• brahman – Brahman, the Absolute reality
  noun (neuter)
• vapus – body, form, nature
  noun (neuter)

Note: Refers to the implied 'you'.

भूत्वा (bhūtvā) - having become

(indeclinable)

absolutive

absolutive form from root `bhū`

Root: bhū (class 1)

कर्म (karma) - action, duty

(noun)

Accusative, neuter, singular of karman

karman - action, deed, work, duty, destiny

from root `kṛ`

Root: kṛ (class 8)

ब्रह्म-मयम् (brahma-mayam) - as Brahman (brahman)-pervaded (consisting of Brahman, pervaded by Brahman)

(adjective)

Accusative, neuter, singular of brahmamaya

brahmamaya - consisting of Brahman, full of Brahman

from `brahman` + suffix `maya` (made of, consisting of)

Compound type : tatpuruṣa (brahman+maya)

• brahman – Brahman, the Absolute reality
  noun (neuter)
• maya – consisting of, made of
  suffix
  suffix used to form adjectives

Note: Modifies `karma`.

कुरु (kuru) - do, perform

(verb)

2nd person , singular, active, imperative (lot) of kṛ

Root: kṛ (class 8)

ब्रह्म-अर्पण-समाचारः (brahma-arpaṇa-samācāraḥ) - with your conduct characterized by offering everything to Brahman (brahman) (one whose conduct is offering to Brahman)

(adjective)

Nominative, masculine, singular of brahmārpaṇasamācāra

brahmārpaṇasamācāra - one whose behavior/conduct is offering to Brahman

Compound type : bahuvrīhi (brahman+arpaṇa+samācāra)

• brahman – Brahman, the Absolute reality
  noun (neuter)
• arpaṇa – offering, entrusting, dedication
  noun (neuter)
  from root `ṛ` (`ar`) with `ni` prefix
  Prefix: ni
  Root: ṛ (class 3)
• samācāra – conduct, behavior, custom
  noun (masculine)
  from `sam` + `ā` + root `car`
  Prefixes: sam+ā
  Root: car (class 1)

Note: Refers to the implied 'you'.

ब्रह्म (brahma) - Brahman

(noun)

Nominative, neuter, singular of brahman

brahman - Brahman, the Absolute reality

एव (eva) - indeed, only, just

(indeclinable)

भवसि (bhavasi) - you become, you are

(verb)

2nd person , singular, active, present (lat) of bhū

Root: bhū (class 1)

क्षणात् (kṣaṇāt) - instantly, in a moment, from a moment

(noun)

Ablative, masculine, singular of kṣaṇa

kṣaṇa - moment, instant

Note: Used adverbially to mean 'instantly'.