योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-30, verse-24

शरीरावसथायां च चलायां तत्प्रसादतः ।
सोऽस्यां गहनकोशायां ह्रद्गुहायां गुहेश्वरः ॥ २४ ॥

śarīrāvasathāyāṃ ca calāyāṃ tatprasādataḥ ,
so'syāṃ gahanakośāyāṃ hradguhāyāṃ guheśvaraḥ 24

24. śarīrāvasathāyām ca calāyām tatprasādataḥ saḥ
asyām gahanakośāyām hṛd-guhāyām guheśvaraḥ

24. ca tatprasādataḥ saḥ asyām śarīrāvasathāyām
calāyām gahanakośāyām hṛd-guhāyām guheśvaraḥ

24. And by His grace, He resides in this body, which is a mutable abode, within its deep sheath, specifically in the cave of the heart, as the Lord of the cave.

Words meanings summery:

• शरीरावसथायाम् (śarīrāvasathāyām) - describing the body as a dwelling place (in the body-abode, in the abode which is the body)

• च (ca) - and, also

• चलायाम् (calāyām) - describing the body as mutable and impermanent (in the mutable, in the unsteady, in the moving)

• तत्प्रसादतः (tatprasādataḥ) - due to the grace of the supreme Self (by His grace, by its favor)

• सः (saḥ) - he, that

• अस्याम् (asyām) - in this body (in this (feminine))

• गहनकोशायाम् (gahanakośāyām) - in the subtle layers or cavity of the heart (in the deep sheath, in the profound enclosure)

• हृद्-गुहायाम् (hṛd-guhāyām) - in the spiritual core or inner chamber of consciousness within the heart (in the cave of the heart)

• गुहेश्वरः (guheśvaraḥ) - the supreme Self residing as the Lord within the cave of the heart (the Lord of the cave)

Words meanings and morphology

शरीरावसथायाम् (śarīrāvasathāyām) - describing the body as a dwelling place (in the body-abode, in the abode which is the body)

(noun)

Locative, feminine, singular of śarīrāvasathā

śarīrāvasathā - body-dwelling, an abode that is the body

Compound type : karmadhāraya (śarīra+āvasathā)

• śarīra – body
  noun (neuter)
• āvasathā – dwelling, abode, residence
  noun (feminine)

च (ca) - and, also

(indeclinable)

चलायाम् (calāyām) - describing the body as mutable and impermanent (in the mutable, in the unsteady, in the moving)

(adjective)

Locative, feminine, singular of calā

cala - moving, unsteady, shaking, changing, perishable

Feminine form of cala

Root: cal (class 1)

तत्प्रसादतः (tatprasādataḥ) - due to the grace of the supreme Self (by His grace, by its favor)

(indeclinable)

Compound type : tatpuruṣa (tad+prasāda)

• tad – His, its
  pronoun (neuter)
• prasāda – grace, favor, blessing, clearness, serenity
  noun (masculine)
  Prefix: pra
  Root: sad (class 1)

Note: Ablative singular of 'tatprasāda' used adverbially

सः (saḥ) - he, that

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

अस्याम् (asyām) - in this body (in this (feminine))

(pronoun)

Locative, feminine, singular of idam

idam - this, this one

गहनकोशायाम् (gahanakośāyām) - in the subtle layers or cavity of the heart (in the deep sheath, in the profound enclosure)

(noun)

Locative, feminine, singular of gahanakośa

gahanakośa - deep sheath, profound cavity

Compound type : karmadhāraya (gahana+kośa)

• gahana – deep, dense, impenetrable, profound
  adjective (neuter)
• kośa – sheath, casing, treasury, budget, cavity
  noun (masculine)

हृद्-गुहायाम् (hṛd-guhāyām) - in the spiritual core or inner chamber of consciousness within the heart (in the cave of the heart)

(noun)

Locative, feminine, singular of hṛd-guhā

hṛd-guhā - cave of the heart

Compound type : ṣaṣṭhī tatpuruṣa (hṛd+guhā)

• hṛd – heart, mind, soul
  noun (neuter)
• guhā – cave, cavern, hiding place
  noun (feminine)

गुहेश्वरः (guheśvaraḥ) - the supreme Self residing as the Lord within the cave of the heart (the Lord of the cave)

(noun)

Nominative, masculine, singular of guheśvara

guheśvara - Lord of the cave (often referring to Shiva or the supreme Self)

Compound type : ṣaṣṭhī tatpuruṣa (guhā+īśvara)

• guhā – cave, cavern, hiding place
  noun (feminine)
• īśvara – lord, master, controller, God
  noun (masculine)