योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-13, verse-36

आत्मगर्भगृहं चित्ताद्यथासंकल्पमात्मनः ।
देशकालक्रियाद्रव्यकल्पनावेदनं स तत् ॥ ३६ ॥

ātmagarbhagṛhaṃ cittādyathāsaṃkalpamātmanaḥ ,
deśakālakriyādravyakalpanāvedanaṃ sa tat 36

36. ātmagarbhagṛham cittāt yathāsaṅkalpam ātmanaḥ
deśakālakriyādravyakalpanāvedanam saḥ tat

36. saḥ tat deśakālakriyādravyakalpanāvedanam
ātmanaḥ ātmagarbhagṛham cittāt yathāsaṅkalpam

36. That (subtle self) is indeed the experience (vedana) of conceiving space, time, action, and substance. This (experience) is like the inner chamber of the individual self (ātman), originating from the mind (citta), according to the self's own resolve (saṅkalpa).

Words meanings summery:

• आत्मगर्भगृहम् (ātmagarbhagṛham) - the inner chamber of the self; the womb-like space of the self

• चित्तात् (cittāt) - from the mind (citta)

• यथासङ्कल्पम् (yathāsaṅkalpam) - according to one's resolve/conception; as one conceives

• आत्मनः (ātmanaḥ) - of the self (ātman)

• देशकालक्रियाद्रव्यकल्पनावेदनम् (deśakālakriyādravyakalpanāvedanam) - the experience of conceiving space, time, action, and substance

• सः (saḥ) - that subtle self/being (he, that (masculine))

• तत् (tat) - that (experience) (that (neuter))

Words meanings and morphology

आत्मगर्भगृहम् (ātmagarbhagṛham) - the inner chamber of the self; the womb-like space of the self

(noun)

Accusative, neuter, singular of ātmagarbhagṛha

ātmagarbhagṛha - inner chamber of the self, womb-like house of the self

Compound type : tatpuruṣa (ātman+garbha+gṛha)

• ātman – self, soul, spirit
  noun (masculine)
• garbha – womb, interior, embryo
  noun (masculine)
• gṛha – house, home, chamber
  noun (neuter)

चित्तात् (cittāt) - from the mind (citta)

(noun)

Ablative, neuter, singular of citta

citta - mind, consciousness, thought

यथासङ्कल्पम् (yathāsaṅkalpam) - according to one's resolve/conception; as one conceives

(indeclinable)

Compound type : avyayībhāva (yathā+saṅkalpa)

• yathā – as, in accordance with, according to
  indeclinable
• saṅkalpa – resolve, intention, conception, volition
  noun (masculine)
  From root kḷp with prefix sam-
  Prefix: sam
  Root: kḷp (class 1)

आत्मनः (ātmanaḥ) - of the self (ātman)

(noun)

Genitive, masculine, singular of ātman

ātman - self, soul, spirit

देशकालक्रियाद्रव्यकल्पनावेदनम् (deśakālakriyādravyakalpanāvedanam) - the experience of conceiving space, time, action, and substance

(noun)

Accusative, neuter, singular of deśakālakriyādravyakalpanāvedana

deśakālakriyādravyakalpanāvedana - experience of conceiving space, time, action, and substance

Compound type : tatpuruṣa (deśa+kāla+kriyā+dravya+kalpanā+vedana)

• deśa – space, place, region
  noun (masculine)
• kāla – time
  noun (masculine)
• kriyā – action, activity, rite
  noun (feminine)
• dravya – substance, material, thing
  noun (neuter)
• kalpanā – conception, imagination, mental fabrication
  noun (feminine)
• vedana – knowledge, perception, experience, sensation
  noun (neuter)
  Derived from root vid (to know)
  Root: vid (class 2)

सः (saḥ) - that subtle self/being (he, that (masculine))

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

तत् (tat) - that (experience) (that (neuter))

(pronoun)

Nominative, neuter, singular of tad

tad - that, he, she, it

Note: Used as the predicate nominative, referring to 'vedana'