योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-100, verse-26

संकल्पेन यदा याति त्वसंकल्पेन गच्छति ।
पवनेन महाबाहो ज्वालाजालमिवानले ॥ २६ ॥

saṃkalpena yadā yāti tvasaṃkalpena gacchati ,
pavanena mahābāho jvālājālamivānale 26

26. saṃkalpena yadā yāti tu asaṃkalpena gacchati
pavanena mahābāho jvālā-jālam iva anale

26. mahābāho! yadā [jīvaḥ] saṃkalpena yāti,
tu asaṃkalpena gacchati.
[idam] pavanena anale jvālā-jālam iva [bhavati].

26. O mighty-armed one, just as a mass of flames in a fire flares up due to wind and subsides (or behaves differently) without it, similarly, one progresses with volition (saṃkalpa) and moves (or ceases to move) without volition.

Words meanings summery:

• संकल्पेन (saṁkalpena) - by intention, by volition, by determination

• यदा (yadā) - when, at which time

• याति (yāti) - moves, progresses (like flames spreading due to wind) (goes, moves, reaches, proceeds)

• तु (tu) - contrasting conjunction (but, on the other hand, indeed)

• असंकल्पेन (asaṁkalpena) - by absence of intention, without volition

• गच्छति (gacchati) - moves, operates, or perhaps 'subsides' (in analogy with flames) (goes, moves, approaches, falls into)

• पवनेन (pavanena) - by the wind

• महाबाहो (mahābāho) - A common epithet for warriors, like Arjuna, indicating strength and prowess. (O mighty-armed one)

• ज्वाला-जालम् (jvālā-jālam) - mass of flames, network of flames

• इव (iva) - like, as, as if

• अनले (anale) - in fire

Words meanings and morphology

संकल्पेन (saṁkalpena) - by intention, by volition, by determination

(noun)

Instrumental, masculine, singular of saṃkalpa

saṁkalpa - intention, volition, determination, mental formation, resolve

Prefix: sam

Root: kḷp (class 1)

यदा (yadā) - when, at which time

(indeclinable)

याति (yāti) - moves, progresses (like flames spreading due to wind) (goes, moves, reaches, proceeds)

(verb)

3rd person , singular, active, present (lat) of yā

Root: yā (class 2)

तु (tu) - contrasting conjunction (but, on the other hand, indeed)

(indeclinable)

असंकल्पेन (asaṁkalpena) - by absence of intention, without volition

(noun)

Instrumental, masculine, singular of asaṃkalpa

asaṁkalpa - lack of intention, absence of volition

Compound type : nañ-tatpuruṣa (a+saṃkalpa)

• a – not, non-, un-
  indeclinable
• saṃkalpa – intention, volition, determination, mental formation
  noun (masculine)
  Prefix: sam
  Root: kḷp (class 1)

गच्छति (gacchati) - moves, operates, or perhaps 'subsides' (in analogy with flames) (goes, moves, approaches, falls into)

(verb)

3rd person , singular, active, present (lat) of gam

Root: gam (class 1)

पवनेन (pavanena) - by the wind

(noun)

Instrumental, masculine, singular of pavana

pavana - wind, air, purifier

Root: pū (class 1)

महाबाहो (mahābāho) - A common epithet for warriors, like Arjuna, indicating strength and prowess. (O mighty-armed one)

(adjective)

Vocative, masculine, singular of mahābāhu

mahābāhu - mighty-armed, one with great arms

Compound type : bahuvrīhi (mahā+bāhu)

• mahā – great, mighty, large
  adjective (feminine)
• bāhu – arm
  noun (masculine)

ज्वाला-जालम् (jvālā-jālam) - mass of flames, network of flames

(noun)

Nominative, neuter, singular of jvālā-jāla

jvālā-jāla - mass of flames, network of flames

Compound type : tatpuruṣa (jvālā+jāla)

• jvālā – flame, blaze
  noun (feminine)
  Root: jval (class 1)
• jāla – net, network, mass, multitude
  noun (neuter)

इव (iva) - like, as, as if

(indeclinable)

अनले (anale) - in fire

(noun)

Locative, masculine, singular of anala

anala - fire, Agni (god of fire)