योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-50, verse-83

आमन्थरं देहगुहासु गुप्तं संकल्पघोराजगरं जवेन ।
अकामनानाममहानलेन बलेन दग्ध्वा विभवो भव त्वम् ॥ ८३ ॥

āmantharaṃ dehaguhāsu guptaṃ saṃkalpaghorājagaraṃ javena ,
akāmanānāmamahānalena balena dagdhvā vibhavo bhava tvam 83

83. āmantharam dehaguhāsu guptam saṃkalpaghorājagaram javena
akāmanānāmamahānalena balena dagdhvā vibhavaḥ bhava tvam

83. tvam dehaguhāsu āmantharam guptam saṃkalpaghorājagaram,
akāmanānāmamahānalena balena javena dagdhvā,
vibhavaḥ bhava.

83. You, having swiftly and strongly burnt the terrible python of intention (saṃkalpa), which is hidden sluggishly in the caves of the body, with the great fire named non-desire (akāmanā), become truly powerful (vibhava).

Words meanings summery:

• आमन्थरम् (āmantharam) - deeply, firmly (referring to how it is hidden) (sluggishly, very slowly, intensely)

• देहगुहासु (dehaguhāsu) - in the deepest recesses of one's being (in the caves of the body)

• गुप्तम् (guptam) - hidden, concealed, secret

• संकल्पघोराजगरम् (saṁkalpaghorājagaram) - the formidable inner force of volition and mental constructs (the terrible python of intention (saṃkalpa))

• जवेन (javena) - swiftly, quickly, with speed

• अकामनानाममहानलेन (akāmanānāmamahānalena) - through the power of cultivating the absence of desire (by the great fire named non-desire)

• बलेन (balena) - by strength, with power

• दग्ध्वा (dagdhvā) - having burnt

• विभवः (vibhavaḥ) - one who has achieved spiritual power or liberation (power, prosperity, glory, spiritual eminence)

• भव (bhava) - attain (that state of vibhava) (become, be)

• त्वम् (tvam) - you

Words meanings and morphology

आमन्थरम् (āmantharam) - deeply, firmly (referring to how it is hidden) (sluggishly, very slowly, intensely)

(indeclinable)

ā (intensifier) + mantharam (slow, dull). Adverbial.

Note: Adverbial.

देहगुहासु (dehaguhāsu) - in the deepest recesses of one's being (in the caves of the body)

(noun)

Locative, feminine, plural of dehaguhā

dehaguhā - body-cave

Compound type : ṣaṣṭhī-tatpuruṣa (deha+guhā)

• deha – body, physical form
  noun (masculine)
  Root: dih (class 2)
• guhā – cave, cavern, secret place
  noun (feminine)
  Root: guh (class 1)

Note: Location of the saṃkalpaghorājagaram.

गुप्तम् (guptam) - hidden, concealed, secret

(adjective)

Accusative, masculine, singular of gupta

gupta - hidden, guarded, protected

Past Passive Participle

Derived from root gup (to protect, to hide).

Root: gup (class 1)

Note: Adjective modifying saṃkalpaghorājagaram.

संकल्पघोराजगरम् (saṁkalpaghorājagaram) - the formidable inner force of volition and mental constructs (the terrible python of intention (saṃkalpa))

(noun)

Accusative, masculine, singular of saṃkalpaghorājagara

saṁkalpaghorājagara - the terrible python of intention/volition

Compound type : karmadhāraya (saṃkalpa+ghora+ajagara)

• saṃkalpa – intention, volition, resolve, conception (saṃkalpa)
  noun (masculine)
  Derived from root kḷp with sam.
  Prefix: sam
  Root: kḷp (class 10)
• ghora – terrible, dreadful, formidable
  adjective
  Root: ghur (class 1)
• ajagara – python, boa constrictor
  noun (masculine)
  Derived from aja (goat) + gara (swallowing), 'goat-swallower'.
  Root: gṛ (class 6)

Note: Object of dagdhvā.

जवेन (javena) - swiftly, quickly, with speed

(noun)

Instrumental, masculine, singular of java

java - speed, swiftness, quickness

Derived from root jū (to be swift).

Root: jū

Note: Adverbial, indicates manner of burning.

अकामनानाममहानलेन (akāmanānāmamahānalena) - through the power of cultivating the absence of desire (by the great fire named non-desire)

(noun)

Instrumental, masculine, singular of akāmanānāmamahānala

akāmanānāmamahānala - great fire named non-desire

Compound type : karmadhāraya (akāmanā+nāma+mahānala)

• akāmanā – non-desire, absence of desire (akāmanā)
  noun (feminine)
  a (negation) + kāmanā (desire).
  Prefix: a
  Root: kam (class 1)
• nāma – named, by name (adverbial use)
  indeclinable
  Originally an accusative, used adverbially.
• mahānala – great fire
  noun (masculine)
  Karmadhāraya compound.

Note: Means/instrument for dagdhvā.

बलेन (balena) - by strength, with power

(noun)

Instrumental, neuter, singular of bala

bala - strength, power, force

Note: Means/instrument for dagdhvā.

दग्ध्वा (dagdhvā) - having burnt

(indeclinable)

Absolutive (Gerund)

Derived from root dah (class 1) with suffix tvā.

Root: dah (class 1)

Note: Forms an absolutive clause, action completed before main verb.

विभवः (vibhavaḥ) - one who has achieved spiritual power or liberation (power, prosperity, glory, spiritual eminence)

(noun)

Nominative, masculine, singular of vibhava

vibhava - power, greatness, prosperity, development, manifestation, spiritual eminence (vibhava)

Derived from root bhū (to be) with upasarga vi.

Prefix: vi

Root: bhū (class 1)

Note: Predicate nominative for tvam (implied).

भव (bhava) - attain (that state of vibhava) (become, be)

(verb)

2nd person , singular, active, imperative (loṭ) of bhū

Imperative

Derived from root bhū (class 1).

Root: bhū (class 1)

Note: Main verb of the sentence.

त्वम् (tvam) - you

(pronoun)

Nominative, singular of tvam

yuṣmad - you

Note: Subject of bhava.