योगवासिष्ठः yogavāsiṣṭhaḥ - book-1, chapter-18, verse-61

तडित्सु शरदभ्रेषु गन्धर्वनगरेषु च ।
स्थैर्यं येन विनिर्णीतं स विश्वसितु विग्रहे ॥ ६१ ॥

taḍitsu śaradabhreṣu gandharvanagareṣu ca ,
sthairyaṃ yena vinirṇītaṃ sa viśvasitu vigrahe 61

61. tadiṭsu śaradabhreṣu gandharvanagareṣu ca
sthairyam yena vinirṇītam sa viśvasitu vigrahe

61. yena tadiṭsu śaradabhreṣu gandharvanagareṣu ca sthairyam vinirṇītam,
sa vigrahe viśvasitu.

61. He by whom stability is ascertained in lightning flashes, in autumn clouds, and in illusory cities (gandharvanagara), let him trust in the physical body.

Words meanings summery:

• तदिट्सु (tadiṭsu) - in lightning flashes

• शरदभ्रेषु (śaradabhreṣu) - in autumn clouds

• गन्धर्वनगरेषु (gandharvanagareṣu) - in illusory cities, in cities of Gandharvas

• च (ca) - and

• स्थैर्याम् (sthairyām) - stability, permanence

• येन (yena) - by whom, by which

• विनिर्णीतम् (vinirṇītam) - ascertained, determined

• स (sa) - he, that

• विश्वसितु (viśvasitu) - may trust, let him trust

• विग्रहे (vigrahe) - in the physical body (implying its impermanence) (in the body, in conflict)

Words meanings and morphology

तदिट्सु (tadiṭsu) - in lightning flashes

(noun)

Locative, feminine, plural of tadiṭ

tadiṭ - lightning, flash

शरदभ्रेषु (śaradabhreṣu) - in autumn clouds

(noun)

Locative, neuter, plural of śaradabhra

śaradabhra - autumn cloud

Compound type : tatpurusha (śarad+abhra)

• śarad – autumn
  noun (feminine)
• abhra – cloud, sky
  noun (neuter)

गन्धर्वनगरेषु (gandharvanagareṣu) - in illusory cities, in cities of Gandharvas

(noun)

Locative, neuter, plural of gandharvanagara

gandharvanagara - city of Gandharvas (an illusion, a mirage)

Compound type : tatpurusha (gandharva+nagara)

• gandharva – celestial musician; an illusory being or phenomenon
  noun (masculine)
• nagara – city, town
  noun (neuter)

च (ca) - and

(indeclinable)

स्थैर्याम् (sthairyām) - stability, permanence

(noun)

Accusative, neuter, singular of sthairya

sthairya - steadiness, firmness, stability, permanence

Derived from sthira (firm, steady) with suffix -ya.

येन (yena) - by whom, by which

(pronoun)

Instrumental, masculine, singular of yad

yad - who, which, what

विनिर्णीतम् (vinirṇītam) - ascertained, determined

(adjective)

Nominative, neuter, singular of vinirṇīta

vinirṇīta - determined, ascertained, decided

Past Passive Participle

Formed from root nī (to lead) with prefixes vi and nir, and suffix -ta.

Prefixes: vi+nir

Root: nī (class 1)

स (sa) - he, that

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

विश्वसितु (viśvasitu) - may trust, let him trust

(verb)

3rd person , singular, active, imperative (loṭ) of viśvas

Prefix: vi

Root: śvas (class 2)

विग्रहे (vigrahe) - in the physical body (implying its impermanence) (in the body, in conflict)

(noun)

Locative, masculine, singular of vigraha

vigraha - body, form, shape; conflict, war; separation