योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-94, verse-80

यथा यत्रेह वै निम्ना जलं तत्रावतिष्ठते ।
तथा यत्र पिशाचाद्यास्तमस्तत्रावतिष्ठते ॥ ८० ॥

yathā yatreha vai nimnā jalaṃ tatrāvatiṣṭhate ,
tathā yatra piśācādyāstamastatrāvatiṣṭhate 80

80. yathā yatra iha vai nimnā jalam tatra avatiṣṭhate
| tathā yatra piśāca-ādyāḥ tamaḥ tatra avatiṣṭhate

80. yathā jalam iha vai nimnā tatra avatiṣṭhate
tathā tamaḥ yatra piśāca-ādyāḥ tatra avatiṣṭhate

80. Just as water naturally settles here in low-lying ground, similarly, wherever ghosts and other such beings are present, darkness resides there.

Words meanings summery:

• यथा (yathā) - just as, as, according to

• यत्र (yatra) - where, in which place

• इह (iha) - here, in this world, now

• वै (vai) - indeed, certainly, verily (an emphatic particle)

• निम्ना (nimnā) - in a low-lying place, depression, low ground

• जलम् (jalam) - water

• तत्र (tatra) - there, in that place

• अवतिष्ठते (avatiṣṭhate) - remains, stands, settles, dwells

• तथा (tathā) - similarly, so, thus

• यत्र (yatra) - where, in which place

• पिशाच-आद्याः (piśāca-ādyāḥ) - ghosts and others, spirits etc.

• तमः (tamaḥ) - darkness, gloom, ignorance

• तत्र (tatra) - there, in that place

• अवतिष्ठते (avatiṣṭhate) - remains, stands, settles, dwells

Words meanings and morphology

यथा (yathā) - just as, as, according to

(indeclinable)

यत्र (yatra) - where, in which place

(indeclinable)

इह (iha) - here, in this world, now

(indeclinable)

वै (vai) - indeed, certainly, verily (an emphatic particle)

(indeclinable)

निम्ना (nimnā) - in a low-lying place, depression, low ground

(adjective)

Nominative, feminine, singular of nimna

nimna - low, deep, depressed; low-lying ground, depression, abyss

जलम् (jalam) - water

(noun)

Nominative, neuter, singular of jala

jala - water, fluid, moisture

तत्र (tatra) - there, in that place

(indeclinable)

अवतिष्ठते (avatiṣṭhate) - remains, stands, settles, dwells

(verb)

3rd person , singular, middle, present (laṭ) of sthā

Root sthā (1st class) with upasarga ava-.

Prefix: ava

Root: sthā (class 1)

तथा (tathā) - similarly, so, thus

(indeclinable)

यत्र (yatra) - where, in which place

(indeclinable)

पिशाच-आद्याः (piśāca-ādyāḥ) - ghosts and others, spirits etc.

(noun)

Nominative, masculine, plural of piśācādya

piśācādya - beginning with piśācas, ghosts and similar beings

Compound type : bahuvrīhi (piśāca+ādya)

• piśāca – ghost, demon, fiend, goblin
  noun (masculine)
• ādya – first, foremost, principal, beginning with, etc.
  adjective (masculine)

तमः (tamaḥ) - darkness, gloom, ignorance

(noun)

Nominative, neuter, singular of tamas

tamas - darkness, gloom; ignorance, inertia, one of the three guṇas

तत्र (tatra) - there, in that place

(indeclinable)

अवतिष्ठते (avatiṣṭhate) - remains, stands, settles, dwells

(verb)

3rd person , singular, middle, present (laṭ) of sthā

Root sthā (1st class) with upasarga ava-.

Prefix: ava

Root: sthā (class 1)