योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-4, verse-50

प्रकाशस्य यथाऽऽलोको यथा वातस्य चापलम् ।
यथा द्रवत्वं पयसि दृश्यत्वं द्रष्टरीदृशम् ॥ ५० ॥

prakāśasya yathā''loko yathā vātasya cāpalam ,
yathā dravatvaṃ payasi dṛśyatvaṃ draṣṭarīdṛśam 50

50. prakāśasya yathā ālokaḥ yathā vātasya cāpalam
yathā dravatvam payasi dṛśyatvam draṣṭari īdṛśam

50. yathā prakāśasya ālokaḥ yathā vātasya cāpalam yathā
payasi dravatvam tathā draṣṭari dṛśyatvam īdṛśam

50. Just as light (āloka) is inherent to brightness (prakāśa), just as fickleness (cāpalam) is inherent to wind (vāta), and just as fluidity (dravatvam) is inherent to water (payas), similarly, the quality of being perceived (dṛśyatvam) is inherent in the perceiver.

Words meanings summery:

• प्रकाशस्य (prakāśasya) - of brightness (of light, of brightness, of manifestation)

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

• आलोकः (ālokaḥ) - light (as a quality or emanation) (light, sight, looking at)

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

• वातस्य (vātasya) - of wind (of wind, of air)

• चापलम् (cāpalam) - fickleness, unsteadiness (fickleness, unsteadiness, swiftness)

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

• द्रवत्वम् (dravatvam) - fluidity (fluidity, liquidity, state of being liquid)

• पयसि (payasi) - in water (in water, in milk)

• दृश्यत्वम् (dṛśyatvam) - the quality of being perceived (the state of being visible, perceptibility, visibleness)

• द्रष्टरि (draṣṭari) - in the perceiver (in the perceiver, in the seer)

• ईदृशम् (īdṛśam) - similar, of this nature (i.e. inherent) (such, of this kind, similar)

Words meanings and morphology

प्रकाशस्य (prakāśasya) - of brightness (of light, of brightness, of manifestation)

(noun)

Genitive, masculine, singular of prakāśa

prakāśa - light, brightness, splendor, manifestation

Prefix: pra

Root: kāś (class 1)

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

(indeclinable)

आलोकः (ālokaḥ) - light (as a quality or emanation) (light, sight, looking at)

(noun)

Nominative, masculine, singular of āloka

āloka - light, sight, view, appearance

Prefix: ā

Root: lok (class 1)

Note: Refers to the shining quality of prakāśa.

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

(indeclinable)

वातस्य (vātasya) - of wind (of wind, of air)

(noun)

Genitive, masculine, singular of vāta

vāta - wind, air, breath

Root: vā (class 2)

चापलम् (cāpalam) - fickleness, unsteadiness (fickleness, unsteadiness, swiftness)

(noun)

Nominative, neuter, singular of cāpala

cāpala - fickleness, unsteadiness, swiftness, restlessness

Abstract noun derived from 'capala' (fickle)

Note: This is an abstract noun.

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

(indeclinable)

द्रवत्वम् (dravatvam) - fluidity (fluidity, liquidity, state of being liquid)

(noun)

Nominative, neuter, singular of dravatva

dravatva - fluidity, liquidity, the state of being liquid

Abstract noun derived from 'drava' (liquid) with suffix -tva

पयसि (payasi) - in water (in water, in milk)

(noun)

Locative, neuter, singular of payas

payas - water, milk, fluid

दृश्यत्वम् (dṛśyatvam) - the quality of being perceived (the state of being visible, perceptibility, visibleness)

(noun)

Nominative, neuter, singular of dṛśyatva

dṛśyatva - visibleness, perceptibility, the quality of being seen/perceived

Abstract noun derived from 'dṛśya' (visible) with suffix -tva

द्रष्टरि (draṣṭari) - in the perceiver (in the perceiver, in the seer)

(noun)

Locative, masculine, singular of draṣṭṛ

draṣṭṛ - seer, perceiver, observer

Agent noun

root dṛś (to see) + tṛc (agent suffix)

Root: dṛś (class 1)

ईदृशम् (īdṛśam) - similar, of this nature (i.e. inherent) (such, of this kind, similar)

(adjective)

Nominative, neuter, singular of īdṛśa

īdṛśa - such, of this kind, similar, like this

Note: Agrees with dṛśyatvam.