योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-92, verse-31

प्रतिभासार्थतामेति क्षणादेव मनो मुने ।
स्पन्दमात्रात्मकं वारि यथा तुङ्गतरङ्गताम् ॥ ३१ ॥

pratibhāsārthatāmeti kṣaṇādeva mano mune ,
spandamātrātmakaṃ vāri yathā tuṅgataraṅgatām 31

31. pratibhāsārthatām eti kṣaṇāt eva manaḥ mune
spandamātrātmakam vāri yathā tuṅgataraṅgatām

31. mune manaḥ kṣaṇāt eva pratibhāsārthatām eti
yathā spandamātrātmakam vāri tuṅgataraṅgatām

31. O sage, in an instant the mind (manas) attains the state of becoming a perceived object (pratibhāsārthatā), just as water, which is essentially vibration (spandamātrātmaka), becomes high waves.

Words meanings summery:

• प्रतिभासार्थताम् (pratibhāsārthatām) - the state of becoming a perceived object (pratibhāsārthatā) (the state of having an object of perception, state of being an object of manifestation)

• एति (eti) - attains (goes, attains, reaches)

• क्षणात् (kṣaṇāt) - in an instant (from a moment, in an instant)

• एव (eva) - instantly (only, just, indeed, merely)

• मनः (manaḥ) - the mind (manas) (mind, intellect, heart)

• मुने (mune) - O sage (O sage, O ascetic)

• स्पन्दमात्रात्मकम् (spandamātrātmakam) - which is essentially vibration (spandamātrātmaka) (whose nature is merely vibration, essentially vibration)

• वारि (vāri) - water

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

• तुङ्गतरङ्गताम् (tuṅgataraṅgatām) - high waves (the state of being high waves)

Words meanings and morphology

प्रतिभासार्थताम् (pratibhāsārthatām) - the state of becoming a perceived object (pratibhāsārthatā) (the state of having an object of perception, state of being an object of manifestation)

(noun)

Accusative, feminine, singular of pratibhāsārthatā

pratibhāsārthatā - the state of having an object of perception

Compound of pratibhāsa (perception/manifestation), artha (object/meaning), and tā (abstract suffix).

Compound type : tatpuruṣa (pratibhāsa+artha+tā)

• pratibhāsa – appearance, manifestation, perception
  noun (masculine)
  Prefix: prati
  Root: bhā (class 2)
• artha – object, purpose, meaning, wealth
  noun (masculine)
• tā – suffix denoting 'state of being', '-ness'
  indeclinable (feminine)
  abstract noun suffix

Note: Object of eti.

एति (eti) - attains (goes, attains, reaches)

(verb)

3rd person , singular, active, present (laṭ) of i

Present active indicative

Root i (to go), class 2.

Root: i (class 2)

क्षणात् (kṣaṇāt) - in an instant (from a moment, in an instant)

(noun)

Ablative, masculine, singular of kṣaṇa

kṣaṇa - moment, instant, a very short period of time

Note: Used adverbially.

एव (eva) - instantly (only, just, indeed, merely)

(indeclinable)

particle

Note: Emphasizes kṣaṇāt.

मनः (manaḥ) - the mind (manas) (mind, intellect, heart)

(noun)

Nominative, neuter, singular of manas

manas - mind, intellect, heart, consciousness, mental faculty

From root man (to think).

Root: man (class 4)

Note: Subject of eti.

मुने (mune) - O sage (O sage, O ascetic)

(noun)

Vocative, masculine, singular of muni

muni - sage, ascetic, seer, hermit

Note: Addressed to the listener.

स्पन्दमात्रात्मकम् (spandamātrātmakam) - which is essentially vibration (spandamātrātmaka) (whose nature is merely vibration, essentially vibration)

(adjective)

Nominative, neuter, singular of spandamātrātmaka

spandamātrātmaka - whose nature is merely vibration

Bahuvrīhi compound.

Compound type : bahuvrīhi (spanda+mātra+ātman)

• spanda – vibration, movement, throbbing
  noun (masculine)
  From root 'spand' (to tremble)
  Root: spand (class 1)
• mātra – mere, only, measure
  adjective (masculine)
• ātman – self, soul, spirit, essence (ātman)
  noun (masculine)

Note: Qualifies vāri.

वारि (vāri) - water

(noun)

Nominative, neuter, singular of vāri

vāri - water

Note: Subject in the simile.

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

(indeclinable)

particle

Note: Introduces a comparison.

तुङ्गतरङ्गताम् (tuṅgataraṅgatām) - high waves (the state of being high waves)

(noun)

Accusative, feminine, singular of tuṅgataraṅgatā

tuṅgataraṅgatā - the state of being high waves, high-wave-ness

Compound of tuṅga (high), taraṅga (wave), and tā (abstract suffix).

Compound type : tatpuruṣa (tuṅga+taraṅga+tā)

• tuṅga – high, lofty, elevated
  adjective (masculine)
• taraṅga – wave
  noun (masculine)
  From root 'tṛ' (to cross)
  Root: tṛ (class 1)
• tā – suffix denoting 'state of being', '-ness'
  indeclinable (feminine)
  abstract noun suffix

Note: Object of implied verb eti.