योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-31, verse-50

यत्र प्राणो मरुद्याति यत्रेन्दुस्तत्र तच्छविः ।
संवित्तिः पवनस्पन्दान्नाडीसंस्पर्शनश्च सः ॥ ५० ॥

yatra prāṇo marudyāti yatrendustatra tacchaviḥ ,
saṃvittiḥ pavanaspandānnāḍīsaṃsparśanaśca saḥ 50

50. yatra prāṇaḥ marut yāti yatra induḥ tatra tat-chaviḥ
saṃvittiḥ pavana-spandāt nāḍī-saṃsparśanaḥ ca saḥ

50. yatra prāṇaḥ marut yāti,
yatra induḥ (asti) tatra tat-chaviḥ.
saṃvittiḥ pavana-spandāt (jāyate).
ca saḥ nāḍī-saṃsparśanaḥ.

50. Wherever the vital energy (prāṇa) moves like wind, and wherever the moon is, there is its radiance. Sensation (saṃvitti) arises from the vibration of the vital air, and that [sensation] is indeed the activation of the subtle energy channels (nāḍīs).

Words meanings summery:

• यत्र (yatra) - wherever (where, in which place, whenever)

• प्राणः (prāṇaḥ) - vital energy (prāṇa) (breath, vital air, life-force)

• मरुत् (marut) - wind (as an analogy for movement) (wind, air, vital air)

• याति (yāti) - moves (goes, moves, proceeds)

• यत्र (yatra) - wherever (where, in which place, whenever)

• इन्दुः (induḥ) - moon (moon, drop, spot)

• तत्र (tatra) - there (there, in that place)

• तत्-छविः (tat-chaviḥ) - its radiance (its luster, its radiance)

• संवित्तिः (saṁvittiḥ) - sensation (saṃvitti) (sensation, consciousness, knowledge, perception)

• पवन-स्पन्दात् (pavana-spandāt) - from the vibration of the vital air (from the vibration/movement of the wind/air)

• नाडी-संस्पर्शनः (nāḍī-saṁsparśanaḥ) - activation of the subtle energy channels (nāḍīs) (touching/contact of nāḍīs)

• च (ca) - and, indeed (and, also)

• सः (saḥ) - that (referring to sensation/the process) (he, that, it)

Words meanings and morphology

यत्र (yatra) - wherever (where, in which place, whenever)

(indeclinable)

derived from relative pronoun ya- and suffix -tra

Note: repeated for emphasis

प्राणः (prāṇaḥ) - vital energy (prāṇa) (breath, vital air, life-force)

(noun)

Nominative, masculine, singular of prāṇa

prāṇa - breath, vital air, life-force, vital energy

from root an (to breathe) with prefix pra

Prefix: pra

Root: an (class 2)

मरुत् (marut) - wind (as an analogy for movement) (wind, air, vital air)

(noun)

Nominative, masculine, singular of marut

marut - wind, air, vital air

Root: mṛ

याति (yāti) - moves (goes, moves, proceeds)

(verb)

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

present active indicative

3rd person singular, present tense

Root: yā (class 2)

यत्र (yatra) - wherever (where, in which place, whenever)

(indeclinable)

derived from relative pronoun ya- and suffix -tra

इन्दुः (induḥ) - moon (moon, drop, spot)

(noun)

Nominative, masculine, singular of indu

indu - moon, drop, spot

तत्र (tatra) - there (there, in that place)

(indeclinable)

derived from demonstrative pronoun tad- and suffix -tra

तत्-छविः (tat-chaviḥ) - its radiance (its luster, its radiance)

(noun)

Nominative, feminine, singular of tat-chavi

tat-chavi - its luster, its radiance

compound of tad (that/its) and chavi (luster)

Compound type : tatpurusha (tad+chavi)

• tad – that, its
  pronoun (neuter)
  genitive singular neuter/masculine implied (tat- as pronominal stem)
• chavi – luster, radiance, beauty, color
  noun (feminine)

संवित्तिः (saṁvittiḥ) - sensation (saṃvitti) (sensation, consciousness, knowledge, perception)

(noun)

Nominative, feminine, singular of saṃvitti

saṁvitti - sensation, consciousness, knowledge, perception

from root vid (to know, perceive) with prefix sam

Prefix: sam

Root: vid (class 2)

पवन-स्पन्दात् (pavana-spandāt) - from the vibration of the vital air (from the vibration/movement of the wind/air)

(noun)

Ablative, masculine, singular of pavana-spanda

pavana-spanda - vibration of wind/air

compound of pavana (wind/air) and spanda (vibration/movement)

Compound type : tatpurusha (pavana+spanda)

• pavana – wind, air, vital air
  noun (masculine)
  from root pū (to purify, to blow)
  Root: pū (class 9)
• spanda – vibration, throb, movement
  noun (masculine)
  from root spand (to tremble, to vibrate)
  Root: spand (class 1)

Note: indicates cause or origin

नाडी-संस्पर्शनः (nāḍī-saṁsparśanaḥ) - activation of the subtle energy channels (nāḍīs) (touching/contact of nāḍīs)

(noun)

Nominative, masculine, singular of nāḍī-saṃsparśana

nāḍī-saṁsparśana - touching/contact of nāḍīs (subtle channels)

compound of nāḍī (subtle channel) and saṃsparśana (touching)

Compound type : tatpurusha (nāḍī+saṃsparśana)

• nāḍī – tube, pipe, nerve, subtle energy channel
  noun (feminine)
• saṃsparśana – touching, contact
  noun (neuter)
  from root spṛś (to touch) with prefix sam
  Prefix: sam
  Root: spṛś (class 6)

च (ca) - and, indeed (and, also)

(indeclinable)

सः (saḥ) - that (referring to sensation/the process) (he, that, it)

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, it

nominative singular masculine of tad