योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-4, verse-7

दृश्यात्यन्तासंभवेन ऋते नान्येन हेतुना ।
मनःपिशाचः प्रशमं याति कल्पशतैरपि ॥ ७ ॥

dṛśyātyantāsaṃbhavena ṛte nānyena hetunā ,
manaḥpiśācaḥ praśamaṃ yāti kalpaśatairapi 7

7. dṛśyātyantāsaṃbhavena ṛte na anyena hetunā
manaḥ-piśācaḥ praśamam yāti kalpa-śataiḥ api

7. dṛśyātyantāsaṃbhavena ṛte,
na anyena hetunā manaḥ-piśācaḥ kalpa-śataiḥ api praśamam yāti.

7. Unless there is the absolute non-existence of the perceived (dṛśya), and by no other cause, the mind-demon (manaḥ-piśāca) attains tranquility, not even after hundreds of eons.

Words meanings summery:

• दृश्यात्यन्तासंभवेन (dṛśyātyantāsaṁbhavena) - by the complete absence of the visible, by the non-existence of objects of perception

• ऋते (ṛte) - without, except, apart from

• न (na) - not, no

• अन्येन (anyena) - by another, by other

• हेतुना (hetunā) - by cause, by reason, by means

• मनः-पिशाचः (manaḥ-piśācaḥ) - mind-demon, the demon of the mind

• प्रशमम् (praśamam) - peace, tranquility, cessation, quietude

• याति (yāti) - goes, moves, attains, reaches

• कल्प-शतैः (kalpa-śataiḥ) - by hundreds of eons/kalpas

• अपि (api) - even, also, too, although

Words meanings and morphology

दृश्यात्यन्तासंभवेन (dṛśyātyantāsaṁbhavena) - by the complete absence of the visible, by the non-existence of objects of perception

(noun)

Instrumental, masculine, singular of dṛśyātyantāsaṃbhava

dṛśyātyantāsaṁbhava - complete non-existence of the perceptible

Compound type : tatpuruṣa (dṛśya+atyanta+asaṃbhava)

• dṛśya – perceptible, visible, object of sight
  adjective (neuter)
  Gerundive/Future Passive Participle
  from root dṛś with suffix -ya
  Root: dṛś (class 1)
• atyanta – absolute, extreme, complete
  adjective (neuter)
• asaṃbhava – non-existence, impossibility
  noun (masculine)
  negative of 'saṃbhava' (existence)
  Prefix: a

Note: Used with 'ṛte'.

ऋते (ṛte) - without, except, apart from

(indeclinable)

न (na) - not, no

(indeclinable)

Note: Negates 'anyena hetunā'.

अन्येन (anyena) - by another, by other

(pronoun)

Instrumental, masculine, singular of anya

anya - other, another

Note: Agrees with 'hetunā'.

हेतुना (hetunā) - by cause, by reason, by means

(noun)

Instrumental, masculine, singular of hetu

hetu - cause, reason, motive, means

मनः-पिशाचः (manaḥ-piśācaḥ) - mind-demon, the demon of the mind

(noun)

Nominative, masculine, singular of manas-piśāca

manas-piśāca - mind-demon

Compound type : tatpuruṣa (manas+piśāca)

• manas – mind, intellect, thought
  noun (neuter)
• piśāca – demon, goblin, evil spirit
  noun (masculine)

Note: Subject of the verb 'yāti'.

प्रशमम् (praśamam) - peace, tranquility, cessation, quietude

(noun)

Accusative, masculine, singular of praśama

praśama - peace, tranquility, cessation

Prefix: pra

Root: śam (class 4)

Note: Object of the verb 'yāti'.

याति (yāti) - goes, moves, attains, reaches

(verb)

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

present indicative, active voice

root 'yā', 2nd class, parasmaipada

Root: yā (class 2)

कल्प-शतैः (kalpa-śataiḥ) - by hundreds of eons/kalpas

(noun)

Instrumental, neuter, plural of kalpa-śata

kalpa-śata - hundreds of eons

Compound type : dvigu (kalpa+śata)

• kalpa – eon, cosmic period, a day of Brahmā
  noun (masculine)
• śata – hundred
  noun (neuter)

Note: Indicates duration or means.

अपि (api) - even, also, too, although

(indeclinable)