योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-87, verse-37

अन्तःकरणरूपत्वमेवमत्राहमास्थितः ।
आतिवाहिकदेहात्मा चिन्मयव्योमरूपवान् ॥ ३७ ॥

antaḥkaraṇarūpatvamevamatrāhamāsthitaḥ ,
ātivāhikadehātmā cinmayavyomarūpavān 37

37. antaḥkaraṇarūpatvam evam atra aham āsthitaḥ
ātivāhikadehātmā cinmayavyomarūpavān

37. atra aham evam antaḥkaraṇarūpatvam āsthitaḥ
ātivāhikadehātmā cinmayavyomarūpavān

37. In this manner, I became established here as the very nature of the inner instrument (antaḥkaraṇa). I am the self (ātman) of the subtle, transitional body, endowed with the form of consciousness-space.

Words meanings summery:

• अन्तःकरणरूपत्वम् (antaḥkaraṇarūpatvam) - the state or nature of being the inner instrument

• एवम् (evam) - thus, in this manner, so, indeed

• अत्र (atra) - here, in this place, in this matter

• अहम् (aham) - I

• आस्थितः (āsthitaḥ) - situated, established, remained, stood

• आतिवाहिकदेहात्मा (ātivāhikadehātmā) - the self of the subtle, transitional body

• चिन्मयव्योमरूपवान् (cinmayavyomarūpavān) - endowed with the form of consciousness-space

Words meanings and morphology

अन्तःकरणरूपत्वम् (antaḥkaraṇarūpatvam) - the state or nature of being the inner instrument

(noun)

Nominative, neuter, singular of antaḥkaraṇarūpatva

antaḥkaraṇarūpatva - the state or nature of being the inner instrument; the quality of having the form of the inner instrument

Compound type : tatpuruṣa (antas+karaṇa+rūpa+tva)

• antas – inner, internal
  indeclinable
• karaṇa – instrument, means, making, doing
  noun (neuter)
  agent noun
  Derived from root kṛ (to do) + ana suffix
  Root: kṛ (class 8)
• rūpa – form, shape, nature, appearance
  noun (neuter)
• tva – suffix forming abstract nouns, meaning 'state of being', '-ness'
  suffix (neuter)

एवम् (evam) - thus, in this manner, so, indeed

(indeclinable)

अत्र (atra) - here, in this place, in this matter

(indeclinable)

Locative case of 'idam' (this) with 'tra' suffix

अहम् (aham) - I

(pronoun)

Nominative, singular of asmad

asmad - I, me, my

आस्थितः (āsthitaḥ) - situated, established, remained, stood

(adjective)

Nominative, masculine, singular of āsthita

āsthita - situated, established, remained, stood, entered upon

Past Passive Participle

Derived from root sthā (to stand) with prefix ā (towards, upon)

Prefix: ā

Root: sthā (class 1)

Note: Used here as predicative adjective with 'aham'

आतिवाहिकदेहात्मा (ātivāhikadehātmā) - the self of the subtle, transitional body

(noun)

Nominative, masculine, singular of ātivāhikadehātman

ātivāhikadehātman - whose self is the subtle body (for transition); the self-in-the-subtle-body

Compound type : bahuvrīhi (ātivāhika+deha+ātman)

• ātivāhika – subtle, ethereal, transitional, conveying
  adjective
  Derived from 'ativaha' (carrying over) + 'ika' suffix
  Prefixes: ati+vah
• deha – body
  noun (masculine)
• ātman – self, soul, spirit, essence
  noun (masculine)

चिन्मयव्योमरूपवान् (cinmayavyomarūpavān) - endowed with the form of consciousness-space

(adjective)

Nominative, masculine, singular of cinmayavyomarūpavat

cinmayavyomarūpavat - possessing the form of consciousness-space/ether; having the nature of consciousness-space

Possessive adjective formed with the suffix '-vat'

Compound type : bahuvrīhi (cit+maya+vyoma+rūpa)

• cit – consciousness, intelligence, understanding
  noun (feminine)
• maya – made of, full of, consisting of
  suffix
• vyoma – sky, heaven, space, ether
  noun (neuter)
• rūpa – form, shape, nature, appearance
  noun (neuter)

Note: Describes the 'aham' (I)