योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-100, verse-4

यथा खं सर्वगं शान्तं तथा चिद्व्योम सर्वगम् ।
तदेवैक्यमथ द्वैतमन्यार्थस्यात्यसंभवात् ॥ ४ ॥

yathā khaṃ sarvagaṃ śāntaṃ tathā cidvyoma sarvagam ,
tadevaikyamatha dvaitamanyārthasyātyasaṃbhavāt 4

4. yathā kham sarvagam śāntam tathā cit-vyoma sarvagam | tat
eva aikyam atha dvaitam anya-arthasya aty-asambhavāt ||

4. yathā kham sarvagam śāntam,
tathā cit-vyoma sarvagam tat eva aikyam,
atha (tat eva) dvaitam (ca),
anya-arthasya aty-asambhavāt

4. Just as space (kha) is all-pervading and peaceful, so too is the all-pervading space of consciousness (cid-vyoma). That alone is oneness (ekatva), and even duality (dvaita) ultimately stems from it, because the existence of any separate entity is absolutely impossible.

Words meanings summery:

• यथा (yathā) - as, just as, in which manner

• खम् (kham) - space, ether, sky, vacuum

• सर्वगम् (sarvagam) - all-pervading, omnipresent

• शान्तम् (śāntam) - peaceful, tranquil, calm, quiet

• तथा (tathā) - so, thus, in that manner, similarly

• चित्-व्योम (cit-vyoma) - space of consciousness, conscious ether

• सर्वगम् (sarvagam) - all-pervading, omnipresent

• तत् (tat) - referring to the space of consciousness (that, it)

• एव (eva) - only, indeed, alone, just

• ऐक्यम् (aikyam) - oneness with Brahman (oneness, unity, identity)

• अथ (atha) - then, now, subsequently, moreover

• द्वैतम् (dvaitam) - the concept of duality as an appearance within oneness (duality, dualism, pair)

• अन्य-अर्थस्य (anya-arthasya) - of any other separate entity (of another thing, of another object, of another meaning)

• अत्य्-असम्भवात् (aty-asambhavāt) - due to absolute impossibility, due to utter non-existence

Words meanings and morphology

यथा (yathā) - as, just as, in which manner

(indeclinable)

खम् (kham) - space, ether, sky, vacuum

(noun)

Nominative, neuter, singular of kha

kha - space, ether, sky, vacuum

Note: Can be accusative also, but nominative makes more sense here.

सर्वगम् (sarvagam) - all-pervading, omnipresent

(adjective)

Nominative, neuter, singular of sarvaga

sarvaga - all-pervading, omnipresent, going everywhere

Compound type : tatpuruṣa (sarva+ga)

• sarva – all, every, whole
  adjective
• ga – going, moving, residing in
  adjective
  agent noun from root gam
  Root: gam (class 1)

शान्तम् (śāntam) - peaceful, tranquil, calm, quiet

(Past Passive Participle)

तथा (tathā) - so, thus, in that manner, similarly

(indeclinable)

चित्-व्योम (cit-vyoma) - space of consciousness, conscious ether

(noun)

Nominative, neuter, singular of cit-vyoman

cit-vyoman - space of consciousness, conscious ether

Compound type : tatpuruṣa (cit+vyoman)

• cit – consciousness, thought, intellect
  noun (feminine)
• vyoman – sky, heaven, space, ether
  noun (neuter)

सर्वगम् (sarvagam) - all-pervading, omnipresent

(adjective)

Nominative, neuter, singular of sarvaga

sarvaga - all-pervading, omnipresent, going everywhere

Compound type : tatpuruṣa (sarva+ga)

• sarva – all, every, whole
  adjective
• ga – going, moving, residing in
  adjective
  agent noun from root gam
  Root: gam (class 1)

तत् (tat) - referring to the space of consciousness (that, it)

(pronoun)

Nominative, neuter, singular of tad

tad - that, it

एव (eva) - only, indeed, alone, just

(indeclinable)

ऐक्यम् (aikyam) - oneness with Brahman (oneness, unity, identity)

(noun)

Nominative, neuter, singular of aikya

aikya - oneness, unity, identity, agreement

Derived from eka (one) with the suffix -ya

अथ (atha) - then, now, subsequently, moreover

(indeclinable)

द्वैतम् (dvaitam) - the concept of duality as an appearance within oneness (duality, dualism, pair)

(noun)

Nominative, neuter, singular of dvaita

dvaita - duality, dualism, pair, a set of two

Derived from dvi (two) with the suffix -ta

अन्य-अर्थस्य (anya-arthasya) - of any other separate entity (of another thing, of another object, of another meaning)

(noun)

Genitive, masculine, singular of anya-artha

anya-artha - another thing, different object, other meaning

Compound type : tatpuruṣa (anya+artha)

• anya – other, another, different
  adjective
• artha – meaning, purpose, object, thing, entity
  noun (masculine)

अत्य्-असम्भवात् (aty-asambhavāt) - due to absolute impossibility, due to utter non-existence

(noun)

Ablative, masculine, singular of aty-asambhava

aty-asambhava - absolute impossibility, utter non-existence

Compound type : prādi-samāsa (ati+asambhava)

• ati – very, exceedingly, beyond
  indeclinable
• asambhava – impossibility, non-existence, unlikelihood
  noun (masculine)
  Compound of a (not) + sambhava (possibility/existence)
  Root: bhū (class 1)