योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-80, verse-17

कस्य स्पन्दविलासस्य घनाभ्यासस्य मे वद ।
ब्रह्मन्खगमनाद्येतत्फलं यत्नैकशालिनः ॥ १७ ॥

kasya spandavilāsasya ghanābhyāsasya me vada ,
brahmankhagamanādyetatphalaṃ yatnaikaśālinaḥ 17

17. kasya spandavilāsasya ghanābhyāsasya me vada
brahman khagamanādi etat phalam yatnaikaśālinaḥ

17. brahman me vada kasya spandavilāsasya ghanābhyāsasya (idam
asti)? khagamanādi etat phalam yatnaikaśālinaḥ (bhavati)

17. O Brahman, tell me: to what (ultimate source or cause) does this play of vibration and intense practice belong? This result, exemplified by subtle flight, is obtained by one who is characterized by singular (spiritual) effort.

Words meanings summery:

• कस्य (kasya) - whose? of what?

• स्पन्दविलासस्य (spandavilāsasya) - of the play of vibration, of the sport of pulsation

• घनाभ्यासस्य (ghanābhyāsasya) - of intense practice, of deep repetition

• मे (me) - to me, for me, my

• वद (vada) - tell, speak

• ब्रह्मन् (brahman) - O Brahman! (addressing Vasistha)

• खगमनादि (khagamanādi) - beginning with sky-travel, exemplified by subtle flight

• एतत् (etat) - this

• फलम् (phalam) - fruit, result, outcome

• यत्नैकशालिनः (yatnaikaśālinaḥ) - of one who possesses singular effort, of one excelling in unique endeavor

Words meanings and morphology

कस्य (kasya) - whose? of what?

(pronoun)

Genitive, masculine, singular of kim

kim - who, what, which

स्पन्दविलासस्य (spandavilāsasya) - of the play of vibration, of the sport of pulsation

(noun)

Genitive, masculine, singular of spandavilāsa

spandavilāsa - the play or sport of vibration/pulsation

Compound type : tatpuruṣa (spanda+vilāsa)

• spanda – vibration, pulsation, movement
  noun (masculine)
  Root: spand (class 1)
• vilāsa – play, sport, charm, grace, caprice
  noun (masculine)
  Prefix: vi
  Root: las (class 1)

घनाभ्यासस्य (ghanābhyāsasya) - of intense practice, of deep repetition

(noun)

Genitive, masculine, singular of ghanābhyāsa

ghanābhyāsa - intense practice, deep repetition

Compound type : karmadhāraya (ghana+abhyāsa)

• ghana – dense, solid, intense, deep
  adjective
• abhyāsa – practice, exercise, repetition, study
  noun (masculine)
  Prefixes: abhi+ā
  Root: as (class 4)

मे (me) - to me, for me, my

(pronoun)

Dative, singular of aham

aham - I

Note: Can also be genitive.

वद (vada) - tell, speak

(verb)

2nd person , singular, active, imperative (loṭ) of vad

Root: vad (class 1)

ब्रह्मन् (brahman) - O Brahman! (addressing Vasistha)

(proper noun)

Vocative, masculine, singular of brahman

brahman - Brahma (the creator god), a priest, the Absolute Reality (brahman)

Root: bṛh (class 1)

खगमनादि (khagamanādi) - beginning with sky-travel, exemplified by subtle flight

(adjective)

Nominative, neuter, singular of khagamanādi

khagamanādi - beginning with or including sky-travel/flight

Compound type : tatpuruṣa (khagamana+ādi)

• khagamana – sky-travel, flight, movement through the air
  noun (neuter)
• ādi – beginning, first, etcetera, and so on
  indeclinable

एतत् (etat) - this

(pronoun)

Nominative, neuter, singular of etad

etad - this

फलम् (phalam) - fruit, result, outcome

(noun)

Nominative, neuter, singular of phala

phala - fruit, result, consequence, reward

यत्नैकशालिनः (yatnaikaśālinaḥ) - of one who possesses singular effort, of one excelling in unique endeavor

(adjective)

Genitive, masculine, singular of yatnaikaśālin

yatnaikaśālin - possessing singular effort

Compound type : tatpuruṣa (yatna+eka+śālin)

• yatna – effort, exertion, striving, endeavor
  noun (masculine)
  Root: yat (class 1)
• eka – one, single, unique
  adjective
• śālin – possessing, endowed with, excelling in, characterized by
  adjective
  Root: śāl (class 1)