योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-50, verse-53

तावत्संमोहवेतालो देही यावदनात्मवान् ।
आत्मज्ञ एव संयुक्तश्चेतनेनेति तद्विदः ॥ ५३ ॥

tāvatsaṃmohavetālo dehī yāvadanātmavān ,
ātmajña eva saṃyuktaścetaneneti tadvidaḥ 53

53. tāvat saṃmohavetālaḥ dehī yāvat anātmavān |
ātmajñaḥ eva saṃyuktaḥ cetanena iti tadvidaḥ ||

53. dehī yāvat anātmavān tāvat saṃmohavetālaḥ
ātmajñaḥ eva cetanena saṃyuktaḥ iti tadvidaḥ

53. The demon of delusion (saṃmohavetāla) possesses the embodied being (dehī) as long as they are without knowledge of the Self (ātman). Only one who knows the Self (ātman) is truly united with consciousness; this is what the knowers of Reality (tadvidaḥ) affirm.

Words meanings summery:

• तावत् (tāvat) - so long, as long as, so much, so far

• संमोहवेतालः (saṁmohavetālaḥ) - the demon of delusion, the goblin of confusion

• देही (dehī) - the embodied one, the individual soul

• यावत् (yāvat) - as long as, as far as, to the extent that

• अनात्मवान् (anātmavān) - not self-possessed, without knowledge of the Self, without Self (ātman)

• आत्मज्ञः (ātmajñaḥ) - one who knows the Self, a self-knower

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

• संयुक्तः (saṁyuktaḥ) - united, connected, joined, endowed with

• चेतनेन (cetanena) - by consciousness, with consciousness

• इति (iti) - thus, so, in this manner (marks quoted speech or thought)

• तद्विदः (tadvidaḥ) - those who know that (truth), the knowers of Reality

Words meanings and morphology

तावत् (tāvat) - so long, as long as, so much, so far

(indeclinable)

संमोहवेतालः (saṁmohavetālaḥ) - the demon of delusion, the goblin of confusion

(noun)

Nominative, masculine, singular of saṃmohavetāla

saṁmohavetāla - the demon of delusion

Compound type : tatpuruṣa (saṃmoha+vetāla)

• saṃmoha – delusion, infatuation, confusion
  noun (masculine)
  Prefix: sam
  Root: muh (class 4)
• vetāla – a goblin, a demon, a vampire
  noun (masculine)

देही (dehī) - the embodied one, the individual soul

(noun)

Nominative, masculine, singular of dehin

dehin - embodied, having a body, individual soul, sentient being

from deha + -in (possessive suffix)

यावत् (yāvat) - as long as, as far as, to the extent that

(indeclinable)

अनात्मवान् (anātmavān) - not self-possessed, without knowledge of the Self, without Self (ātman)

(adjective)

Nominative, masculine, singular of anātmavat

anātmavat - not possessing a soul/self; not attentive to the soul/self

from anātman + -vat (possessive suffix)

Compound type : bahuvrīhi (an+ātman+vat)

• an – not, un-
  indeclinable
  negative prefix
• ātman – self, soul, spirit, essential nature
  noun (masculine)
  Root: an (class 2)
• vat – possessing, like, similar to
  suffix
  possessive suffix

आत्मज्ञः (ātmajñaḥ) - one who knows the Self, a self-knower

(noun)

Nominative, masculine, singular of ātmajña

ātmajña - knowing the self, a self-knower

Compound type : tatpuruṣa (ātman+jña)

• ātman – self, soul, spirit, essential nature
  noun (masculine)
  Root: an (class 2)
• jña – knowing, conversant with, knower
  adjective (masculine)
  from root jñā
  Root: jñā (class 9)

एव (eva) - only, just, indeed, precisely

(indeclinable)

संयुक्तः (saṁyuktaḥ) - united, connected, joined, endowed with

(adjective)

Nominative, masculine, singular of saṃyukta

saṁyukta - joined, united, connected, endowed with

Past Passive Participle

from sam-yuj

Prefix: sam

Root: yuj (class 7)

चेतनेन (cetanena) - by consciousness, with consciousness

(noun)

Instrumental, neuter, singular of cetana

cetana - consciousness, mind, soul, sentient

from root cit

Root: cit (class 1)

इति (iti) - thus, so, in this manner (marks quoted speech or thought)

(indeclinable)

तद्विदः (tadvidaḥ) - those who know that (truth), the knowers of Reality

(noun)

Nominative, masculine, plural of tadvid

tadvid - knowing that, a knower of that (truth)

Compound type : tatpuruṣa (tad+vid)

• tad – that, referring to the ultimate truth/brahman
  pronoun (neuter)
• vid – knowing, a knower
  adjective (masculine)
  from root vid
  Root: vid (class 2)