योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-25, verse-34

प्राणः सूर्योऽग्निरथवा पचत्यन्तरिदं वपुः ।
प्राणो हि हृदयाकाशं तापयित्वा प्रतिक्षणम् ॥ ३४ ॥

prāṇaḥ sūryo'gnirathavā pacatyantaridaṃ vapuḥ ,
prāṇo hi hṛdayākāśaṃ tāpayitvā pratikṣaṇam 34

34. prāṇaḥ sūryaḥ agniḥ athavā pacati antaram idam
vapuḥ prāṇaḥ hi hṛdayākāśam tāpayitvā pratikṣaṇam

34. prāṇaḥ sūryaḥ agniḥ athavā idam antaram vapuḥ
pacati hi prāṇaḥ pratikṣaṇam hṛdayākāśam tāpayitvā

34. Prāṇa (life-force), which acts as the sun or fire, processes this inner body. Indeed, prāṇa, constantly heating the heart-space,

Words meanings summery:

• प्राणः (prāṇaḥ) - upward-moving life-force (prāṇa) (vital breath, life-force)

• सूर्यः (sūryaḥ) - sun

• अग्निः (agniḥ) - fire, god of fire

• अथवा (athavā) - or, either...or

• पचति (pacati) - cooks, digests, matures

• अन्तरम् (antaram) - internal, inner, inside

• इदम् (idam) - this

• वपुः (vapuḥ) - body, form

• प्राणः (prāṇaḥ) - upward-moving life-force (prāṇa) (vital breath, life-force)

• हि (hi) - indeed, surely, because

• हृदयाकाशम् (hṛdayākāśam) - heart-space, the space of the heart

• तापयित्वा (tāpayitvā) - having heated, having made warm

• प्रतिक्षणम् (pratikṣaṇam) - every moment, constantly, at every instant

Words meanings and morphology

प्राणः (prāṇaḥ) - upward-moving life-force (prāṇa) (vital breath, life-force)

(noun)

Nominative, masculine, singular of prāṇa

prāṇa - vital breath, life-force, one of the five prāṇas

Prefix: pra

Root: an (class 2)

सूर्यः (sūryaḥ) - sun

(noun)

Nominative, masculine, singular of sūrya

sūrya - sun, solar deity

अग्निः (agniḥ) - fire, god of fire

(noun)

Nominative, masculine, singular of agni

agni - fire, sacrificial fire, god Agni

अथवा (athavā) - or, either...or

(indeclinable)

पचति (pacati) - cooks, digests, matures

(verb)

3rd person , singular, active, present indicative (laṭ) of pac

Root: pac (class 1)

अन्तरम् (antaram) - internal, inner, inside

(adjective)

Accusative, neuter, singular of antara

antara - interior, inner, internal, intermediate

इदम् (idam) - this

(pronoun)

Accusative, neuter, singular of idam

idam - this, he, she, it

वपुः (vapuḥ) - body, form

(noun)

Accusative, neuter, singular of vapus

vapus - body, form, figure

प्राणः (prāṇaḥ) - upward-moving life-force (prāṇa) (vital breath, life-force)

(noun)

Nominative, masculine, singular of prāṇa

prāṇa - vital breath, life-force, one of the five prāṇas

Prefix: pra

Root: an (class 2)

हि (hi) - indeed, surely, because

(indeclinable)

हृदयाकाशम् (hṛdayākāśam) - heart-space, the space of the heart

(noun)

Accusative, masculine, singular of hṛdayākāśa

hṛdayākāśa - heart-space, the space of the heart

Compound type : ṣaṣṭhī-tatpuruṣa (hṛdaya+ākāśa)

• hṛdaya – heart
  noun (neuter)
• ākāśa – space, ether (ākāśa)
  noun (masculine)

तापयित्वा (tāpayitvā) - having heated, having made warm

(indeclinable)

Absolutive (gerund)

Formed from the causative stem of √tap (to heat, to burn).

Root: tap (class 1)

प्रतिक्षणम् (pratikṣaṇam) - every moment, constantly, at every instant

(indeclinable)

Compound type : avyayībhāva (prati+kṣaṇa)

• prati – towards, against, every
  indeclinable
• kṣaṇa – moment, instant
  noun (masculine)