योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-12, verse-4

तदात्मनि स्वयं किंचिच्चेत्यतामिव गच्छति ।
अगृहीतात्मकं संविदहंमर्शनपूर्वकम् ॥ ४ ॥

tadātmani svayaṃ kiṃciccetyatāmiva gacchati ,
agṛhītātmakaṃ saṃvidahaṃmarśanapūrvakam 4

4. tadātmani svayam kiñcit cetyatām iva gacchati
agṛhītātmakam saṃvit ahaṃmarśanapūrvakam

4. tadātmani svayam kiñcit iva cetyatām gacchati.
agṛhītātmakam ahaṃmarśanapūrvakam saṃvit [bhavati].

4. In that Self (ātman), something, as it were, spontaneously attains the state of being cognized. This consciousness (saṃvit), whose true nature is ungrasped, is preceded by the feeling of 'I' or self-perception (ahaṃmarśana).

Words meanings summery:

• तदात्मनि (tadātmani) - in that Self, in its own self

• स्वयम् (svayam) - spontaneously, by itself, oneself

• किञ्चित् (kiñcit) - something, a little, somewhat

• चेत्यताम् (cetyatām) - to the state of being cognized, objectifiability

• इव (iva) - as if, like, as it were

• गच्छति (gacchati) - goes, attains, reaches

• अगृहीतात्मकम् (agṛhītātmakam) - whose nature is ungrasped, of unperceived nature

• संवित् (saṁvit) - consciousness (saṃvit), knowledge, understanding

• अहंमर्शनपूर्वकम् (ahaṁmarśanapūrvakam) - preceded by the 'I'-perception, accompanied by self-awareness

Words meanings and morphology

तदात्मनि (tadātmani) - in that Self, in its own self

(noun)

Locative, masculine, singular of tadātman

tadātman - that self, its own self

Compound type : tatpurusha (tat+ātman)

• tat – that, its
  pronoun (neuter)
• ātman – Self (ātman), soul, essence
  noun (masculine)

स्वयम् (svayam) - spontaneously, by itself, oneself

(indeclinable)

किञ्चित् (kiñcit) - something, a little, somewhat

(pronoun)

Nominative, neuter, singular of kiñcid

kiñcid - something, a little

चेत्यताम् (cetyatām) - to the state of being cognized, objectifiability

(noun)

Accusative, feminine, singular of cetyatā

cetyatā - cognizable state, objectifiability

abstract noun from 'cetya' (that which is to be perceived)

Root: √cit (class 1)

इव (iva) - as if, like, as it were

(indeclinable)

गच्छति (gacchati) - goes, attains, reaches

(verb)

3rd person , singular, active, present (laṭ) of √gam

Root: √gam (class 1)

अगृहीतात्मकम् (agṛhītātmakam) - whose nature is ungrasped, of unperceived nature

(adjective)

Nominative, neuter, singular of agṛhītātmaka

agṛhītātmaka - whose nature is ungrasped

Compound type : bahuvrihi (a+gṛhīta+ātmaka)

• a – not, un-
  indeclinable
  negative prefix
• gṛhīta – grasped, seized, perceived
  adjective (neuter)
  Past Passive Participle
  derived from √grah (to seize, grasp)
  Root: √grah (class 9)
• ātmaka – whose nature is, comprising
  adjective (masculine)

Note: Agrees with 'saṃvit' (if interpreted as neuter here)

संवित् (saṁvit) - consciousness (saṃvit), knowledge, understanding

(noun)

Nominative, feminine, singular of saṃvid

saṁvid - consciousness, knowledge, understanding

from √vid (to know) with prefix sam-

Prefix: sam

Root: √vid (class 2)

अहंमर्शनपूर्वकम् (ahaṁmarśanapūrvakam) - preceded by the 'I'-perception, accompanied by self-awareness

(adjective)

Nominative, neuter, singular of ahaṃmarśanapūrvaka

ahaṁmarśanapūrvaka - preceded by the 'I'-perception, preceded by ego-consciousness

Compound type : karmadhāraya (aham+marśana+pūrvaka)

• aham – I, ego, self
  pronoun
  first person singular pronoun, here implying ego or self-sense
• marśana – reflection, perception, examination
  noun (neuter)
  from √mṛś (to touch, perceive)
  Root: √mṛś (class 6)
• pūrvaka – preceded by, accompanied by
  adjective (masculine)

Note: Agrees with 'saṃvit' (if interpreted as neuter here)