योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-44, verse-25

स्थूलतामेति पाकेन मनो बिल्वफलं यथा ।
मूषास्थद्रुतहेमाभं स्फुरितं विमलाम्बरे ॥ २५ ॥

sthūlatāmeti pākena mano bilvaphalaṃ yathā ,
mūṣāsthadrutahemābhaṃ sphuritaṃ vimalāmbare 25

25. sthūlatām eti pākena manaḥ bilva-phalaṃ yathā
mūṣā-stha-druta-hema-ābhaṃ sphuritaṃ vimala-ambare

25. yathā bilva-phalaṃ (pākena sthūlatām eti),
(tathā) manaḥ pākena sthūlatām eti,
(tat) mūṣā-stha-druta-hema-ābhaṃ vimala-ambare sphuritaṃ

25. Just as a bilva fruit ripens, so too does the mind (manaḥ) attain grossness through maturation, appearing like molten gold in a crucible, throbbing in the clear sky.

Words meanings summery:

• स्थूलताम् (sthūlatām) - grossness (physicality) (grossness, coarseness, bulkiness)

• एति (eti) - attains (goes, comes, attains, reaches)

• पाकेन (pākena) - through maturation (by cooking, by ripening, by maturation)

• मनः (manaḥ) - the mind (manaḥ) (mind, intellect, mental faculty)

• बिल्व-फलं (bilva-phalaṁ) - a bilva fruit (bilva fruit)

• यथा (yathā) - just as (introducing a simile) (just as, as, how)

• मूषा-स्थ-द्रुत-हेम-आभं (mūṣā-stha-druta-hema-ābhaṁ) - appearing like molten gold in a crucible (having the appearance of molten gold in a crucible)

• स्फुरितं (sphuritaṁ) - throbbing (throbbing, trembling, shining, flashing)

• विमल-अम्बरे (vimala-ambare) - in the clear sky (in the clear sky/atmosphere)

Words meanings and morphology

स्थूलताम् (sthūlatām) - grossness (physicality) (grossness, coarseness, bulkiness)

(noun)

Accusative, feminine, singular of sthūlatā

sthūlatā - grossness, thickness, bulkiness, materiality

From `sthūla` (gross) with suffix `-tā` for abstract noun.

Note: Object of `eti`.

एति (eti) - attains (goes, comes, attains, reaches)

(verb)

3rd person , singular, active, present (laṭ) of i

Present Tense, Active Voice

Root `i` (to go).

Root: i (class 2)

पाकेन (pākena) - through maturation (by cooking, by ripening, by maturation)

(noun)

Instrumental, masculine, singular of pāka

pāka - cooking, ripening, maturation, digestion

From root `pac` (to cook, ripen).

Root: pac (class 1)

मनः (manaḥ) - the mind (manaḥ) (mind, intellect, mental faculty)

(noun)

Nominative, neuter, singular of manas

manas - mind, intellect, thought, mental faculty

`s`-stem noun.

Root: man (class 4)

बिल्व-फलं (bilva-phalaṁ) - a bilva fruit (bilva fruit)

(noun)

Nominative, neuter, singular of bilva-phala

bilva-phala - bilva fruit (Aegle marmelos), wood apple

Compound noun.

Compound type : tatpurusha (bilva+phala)

• bilva – Aegle marmelos tree, bilva fruit
  noun (masculine)
• phala – fruit, result, consequence
  noun (neuter)
  Root: phal (class 1)

Note: Subject of the implied `eti` in the simile.

यथा (yathā) - just as (introducing a simile) (just as, as, how)

(indeclinable)

Adverbial particle.

मूषा-स्थ-द्रुत-हेम-आभं (mūṣā-stha-druta-hema-ābhaṁ) - appearing like molten gold in a crucible (having the appearance of molten gold in a crucible)

(adjective)

Nominative, neuter, singular of mūṣā-stha-druta-hema-ābha

mūṣā-stha-druta-hema-ābha - having the appearance of molten gold that is in a crucible

Complex descriptive compound.

Compound type : bahuvrīhi (mūṣā+stha+druta+heman+ābha)

• mūṣā – crucible, melting pot
  noun (feminine)
• stha – standing, situated, being in
  adjective
  From root `sthā` (to stand).
  Root: sthā (class 1)
• druta – melted, fluid, swift, quick
  participle
  Past Passive Participle
  From root `dru` (to flow, melt).
  Root: dru (class 1)
• heman – gold
  noun (neuter)
  `n`-stem noun.
  Root: hā (class 3)
• ābha – resembling, like, having the appearance of
  adjective
  From `ā-bhā` (to shine).
  Prefix: ā
  Root: bhā (class 2)

Note: Modifies `manaḥ` or the implied `vapuḥ`.

स्फुरितं (sphuritaṁ) - throbbing (throbbing, trembling, shining, flashing)

(participle)

Nominative, neuter, singular of sphurita

sphurita - throbbing, flashing, trembling, expanded, blossomed

Past Passive Participle

Derived from root `sphur` (to throb, flash).

Root: sphur (class 6)

Note: Modifies `manaḥ` or the implied `vapuḥ`.

विमल-अम्बरे (vimala-ambare) - in the clear sky (in the clear sky/atmosphere)

(noun)

Locative, neuter, singular of vimala-ambara

vimala-ambara - clear sky, pure atmosphere

Compound noun.

Compound type : karmadhāraya (vimala+ambara)

• vimala – clear, pure, spotless, stainless
  adjective
  From `vi` (privative) + `mala` (stain).
  Prefix: vi
• ambara – sky, atmosphere, clothing
  noun (neuter)
  Root: am (class 1)

Note: Denotes location.