योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-68, verse-51

संसङ्गेनान्तरस्थेन दह्यते प्रकृतिः स्वयम् ।
स्वकलोत्थे नैरकाङ्क्षी पावकेन यथौषधिः ॥ ५१ ॥

saṃsaṅgenāntarasthena dahyate prakṛtiḥ svayam ,
svakalotthe nairakāṅkṣī pāvakena yathauṣadhiḥ 51

51. saṃsaṅgena antaras-thena dahyate prakṛtiḥ svayam
svakalotthe nirākāṅkṣī pāvakena yathā auṣadhiḥ

51. prakṛtiḥ svayam antaras-thena saṃsaṅgena dahyate.
yathā nirākāṅkṣī auṣadhiḥ svakalotthe pāvakena (dahyate).

51. By this internal attachment, nature (prakṛti) itself is consumed, just as a medicinal herb, being without desire (nirākāṅkṣī), is burnt by a fire, when that fire arises from its own inherent heat.

Words meanings summery:

• संसङ्गेन (saṁsaṅgena) - by attachment, by association, through contact

• अन्तरस्-थेन (antaras-thena) - internal, inner, residing within

• दह्यते (dahyate) - is burnt, is consumed, is destroyed

• प्रकृतिः (prakṛtiḥ) - nature (prakṛti), fundamental substance, primal matter

• स्वयम् (svayam) - oneself, by oneself, spontaneously, naturally

• स्वकलोत्थे (svakalotthe) - when born from its own part, in its own inherent arising

• निराकाङ्क्षी (nirākāṅkṣī) - desireless, free from longing, unconcerned

• पावकेन (pāvakena) - by fire, by the purifier

• यथा (yathā) - just as, as, in which way

• औषधिः (auṣadhiḥ) - medicinal herb, plant, drug

Words meanings and morphology

संसङ्गेन (saṁsaṅgena) - by attachment, by association, through contact

(noun)

Instrumental, masculine, singular of saṃsaṅga

saṁsaṅga - attachment, association, contact, adherence

From root `sañj` with prefix `sam`.

Prefix: sam

Root: sañj (class 1)

Note: Refers to the cause of burning.

अन्तरस्-थेन (antaras-thena) - internal, inner, residing within

(adjective)

Instrumental, masculine, singular of antaras-stha

antaras-stha - standing within, internal, inherent, inner

Compound: `antas` (within) + `stha` (standing).

Compound type : tatpuruṣa (antas+stha)

• antas – within, inside, internal
  indeclinable
• stha – standing, situated, existing
  adjective (masculine)
  suffix for agent or location
  Derived from root `sthā`.
  Root: sthā (class 1)

दह्यते (dahyate) - is burnt, is consumed, is destroyed

(verb)

3rd person , singular, passive, present indicative (laṭ) of dah

present passive

3rd person singular present passive from root `dah`.

Root: dah (class 1)

Note: The subject is `prakṛtiḥ`.

प्रकृतिः (prakṛtiḥ) - nature (prakṛti), fundamental substance, primal matter

(noun)

Nominative, feminine, singular of prakṛti

prakṛti - nature (prakṛti), primal matter, fundamental substance, origin, disposition

From `pra-kṛ` (to create, to make).

Prefix: pra

Root: kṛ (class 8)

Note: Subject of `dahyate`.

स्वयम् (svayam) - oneself, by oneself, spontaneously, naturally

(indeclinable)

Emphatic reflexive pronoun/adverb.

Note: Modifies `prakṛtiḥ dahyate`.

स्वकलोत्थे (svakalotthe) - when born from its own part, in its own inherent arising

(adjective)

Locative, masculine, singular of svakalottha

svakalottha - arisen from one's own part/component/heat

Compound `sva` (own) + `kala` (part, heat, seed) + `uttha` (arisen). `a`+`u` sandhi to `o`.

Compound type : tatpuruṣa (sva+kala+uttha)

• sva – own, self, one's own
  adjective (masculine)
• kala – a part, digit of the moon, time, inherent power, heat, minute division
  noun (masculine)
  Root: kal (class 1)
• uttha – arisen, produced, originating from
  adjective (masculine)
  Past Passive Participle-like formation
  From `ud-sthā` (to rise up).
  Prefix: ud
  Root: sthā (class 1)

Note: Adverbial locative, specifying the condition under which the fire acts.

निराकाङ्क्षी (nirākāṅkṣī) - desireless, free from longing, unconcerned

(adjective)

Nominative, feminine, singular of nirākāṅkṣin

nirākāṅkṣin - desireless, free from longing, unconcerned, having no expectations

Compound `nis` (without) + `ākāṅkṣā` (desire, longing).

Compound type : bahuvrīhi (nis+ākāṅkṣā)

• nis – out, forth, without, free from
  indeclinable
  Prefix denoting absence or negation.
• ākāṅkṣā – desire, longing, expectation, wish
  noun (feminine)
  From `ā-kāṅkṣ` (to desire).
  Prefix: ā
  Root: kāṅkṣ (class 1)

Note: Qualifies `auṣadhiḥ`.

पावकेन (pāvakena) - by fire, by the purifier

(noun)

Instrumental, masculine, singular of pāvaka

pāvaka - fire, purifier, pure, clear

From root `pū` (to purify).

Root: pū (class 1)

Note: Agent of the passive verb `dahyate` (implied).

यथा (yathā) - just as, as, in which way

(indeclinable)

Adverb of comparison.

औषधिः (auṣadhiḥ) - medicinal herb, plant, drug

(noun)

Nominative, feminine, singular of auṣadhi

auṣadhi - medicinal herb, plant, drug, annual plant

From `oṣa` (fire, heat) + `dhi` (holding).

Root: dhā (class 3)