योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-31, verse-31

वातात्कनीनिकास्पन्दस्तद्दीप्तिर्दृष्टिरुच्यते ।
तद्बाह्यवति तद्रूपरूपबोधस्तु चित्परा ॥ ३१ ॥

vātātkanīnikāspandastaddīptirdṛṣṭirucyate ,
tadbāhyavati tadrūparūpabodhastu citparā 31

31. vātāt kanīnikāspandaḥ tatdīptiḥ dṛṣṭiḥ ucyate
| tatbāhyavati tatrūparūpabodhaḥ tu cit parā ||

31. vātāt kanīnikāspandaḥ tatdīptiḥ ca dṛṣṭiḥ ucyate.
tatbāhyavati tatrūparūpabodhaḥ tu parā cit.

31. The movement of the pupil (kanīnikā) caused by vital energy (vāta) and its illumination is called sight (dṛṣṭi). However, the understanding (bodha) of the true form of that external object is supreme consciousness (cit).

Words meanings summery:

• वातात् (vātāt) - from vital energy (prāṇa) (from wind, from air, from vital energy)

• कनीनिकास्पन्दः (kanīnikāspandaḥ) - movement of the pupil

• तत्दीप्तिः (tatdīptiḥ) - the illumination of the pupil (its illumination, its brightness)

• दृष्टिः (dṛṣṭiḥ) - sight, vision, perception, view

• उच्यते (ucyate) - is said, is called, is declared

• तत्बाह्यवति (tatbāhyavati) - in that which is external to it, in the external object

• तत्रूपरूपबोधः (tatrūparūpabodhaḥ) - knowledge of the form of that form, knowledge of its true form

• तु (tu) - but, indeed, however

• चित् (cit) - consciousness, knowledge, thought

• परा (parā) - supreme, highest, ultimate

Words meanings and morphology

वातात् (vātāt) - from vital energy (prāṇa) (from wind, from air, from vital energy)

(noun)

Ablative, masculine, singular of vāta

vāta - wind, air, vital breath, vital energy, bodily humor

From √vā (to blow).

Root: vā (class 2)

कनीनिकास्पन्दः (kanīnikāspandaḥ) - movement of the pupil

(noun)

Nominative, masculine, singular of kanīnikāspanda

kanīnikāspanda - movement of the pupil

From kanīnikā (pupil) + spanda (movement).

Compound type : tatpuruṣa (kanīnikā+spanda)

• kanīnikā – pupil of the eye, little girl
  noun (feminine)
• spanda – movement, tremor, vibration
  noun (masculine)
  Derived from √spand (to tremble, vibrate).
  Root: spand (class 1)

तत्दीप्तिः (tatdīptiḥ) - the illumination of the pupil (its illumination, its brightness)

(noun)

Nominative, feminine, singular of tatdīpti

tatdīpti - its light, its illumination

Compound of tat (that, its) + dīpti (light, brightness).

Compound type : tatpuruṣa (tad+dīpti)

• tad – that, its
  pronoun (neuter)
• dīpti – light, brightness, lustre
  noun (feminine)
  Derived from √dīp (to shine).
  Root: dīp (class 4)

दृष्टिः (dṛṣṭiḥ) - sight, vision, perception, view

(noun)

Nominative, feminine, singular of dṛṣṭi

dṛṣṭi - sight, vision, perception, view, insight

Derived from √dṛś (to see).

Root: dṛś (class 1)

उच्यते (ucyate) - is said, is called, is declared

(verb)

3rd person , singular, passive, present (laṭ) of vac

Present passive indicative

From root √vac (to speak). The 'v' becomes 'u' in passive formations before 'y'.

Root: vac (class 2)

तत्बाह्यवति (tatbāhyavati) - in that which is external to it, in the external object

(adjective)

Locative, masculine, singular of tatbāhyavat

tatbāhyavat - that which is external to it

From tat (that) + bāhya (external) + -vat (possessive suffix).

Compound type : tatpuruṣa (tad+bāhya+vat)

• tad – that
  pronoun (neuter)
• bāhya – external, outer
  adjective (masculine)
  Derived from bahis (outside).
• vat – possessing, having, like
  suffix
  Possessive suffix.

Note: Locative singular of `tatbāhyavat`.

तत्रूपरूपबोधः (tatrūparūpabodhaḥ) - knowledge of the form of that form, knowledge of its true form

(noun)

Nominative, masculine, singular of tatrūparūpabodha

tatrūparūpabodha - knowledge of the specific/true form of that

Compound of tat (that) + rūpa (form) + rūpa (form) + bodha (knowledge).

Compound type : tatpuruṣa (tad+rūpa+rūpa+bodha)

• tad – that
  pronoun (neuter)
• rūpa – form, shape, appearance
  noun (neuter)
• rūpa – form, specific nature, essential characteristic
  noun (neuter)
• bodha – knowledge, understanding, awareness
  noun (masculine)
  Derived from √budh (to know, understand).
  Root: budh (class 1)

तु (tu) - but, indeed, however

(indeclinable)

चित् (cit) - consciousness, knowledge, thought

(noun)

Nominative, feminine, singular of cit

cit - consciousness, intellect, pure intelligence

Derived from √cit (to perceive, observe, know).

Root: cit (class 1)

परा (parā) - supreme, highest, ultimate

(adjective)

Nominative, feminine, singular of para

para - supreme, highest, ultimate, distant, other