योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-96, verse-21

यदा स्पन्दैकधर्मत्वात्कर्तुर्या शून्यशंसिनी ।
आधावति स्पन्दफलं तदा कर्मेत्युदाहृता ॥ २१ ॥

yadā spandaikadharmatvātkarturyā śūnyaśaṃsinī ,
ādhāvati spandaphalaṃ tadā karmetyudāhṛtā 21

21. yadā spandaika-dharmatvāt kartuḥ yā śūnya-śaṃsinī
ādhāvati spanda-phalam tadā karma iti udāhṛtā

21. yadā kartuḥ yā śūnya-śaṃsinī spandaika-dharmatvāt spanda-phalam ādhāvati,
tadā karma iti udāhṛtā.

21. When that (activity) of the agent, which indicates its inherent formlessness and whose sole intrinsic nature (dharma) is vibration (spanda), rushes towards the outcome of that vibration, then it is declared to be action (karma).

Words meanings summery:

• यदा (yadā) - when

• स्पन्दैक-धर्मत्वात् (spandaika-dharmatvāt) - due to having vibration as its sole intrinsic nature (dharma)

• कर्तुः (kartuḥ) - of the doer, of the agent

• या (yā) - which (feminine)

• शून्य-शंसिनी (śūnya-śaṁsinī) - proclaiming emptiness/formlessness

• आधावति (ādhāvati) - runs towards, rushes towards

• स्पन्द-फलम् (spanda-phalam) - result of vibration/activity

• तदा (tadā) - then

• कर्म (karma) - action, deed

• इति (iti) - thus, as

• उदाहृता (udāhṛtā) - is declared, is spoken of

Words meanings and morphology

यदा (yadā) - when

(indeclinable)

स्पन्दैक-धर्मत्वात् (spandaika-dharmatvāt) - due to having vibration as its sole intrinsic nature (dharma)

(noun)

Ablative, neuter, singular of spandaika-dharmatva

spandaika-dharmatva - the state of having vibration as the only intrinsic nature (dharma)

Compound type : tatpuruṣa (spanda+eka+dharma+tva)

• spanda – vibration, movement, throb
  noun (masculine)
  Root: spand (class 1)
• eka – one, single, sole
  adjective
• dharma – intrinsic nature, natural law, constitution, duty
  noun (masculine)
• tva – suffix forming abstract nouns, meaning 'the state of being'
  indeclinable (neuter)
  suffix forming abstract nouns, meaning 'the state of being'

कर्तुः (kartuḥ) - of the doer, of the agent

(noun)

Genitive, masculine, singular of kartṛ

kartṛ - doer, agent, creator

Root: kṛ (class 8)

या (yā) - which (feminine)

(pronoun)

Nominative, feminine, singular of yad

yad - which, what

Note: Refers to the implied activity or tendency that is called 'karma'

शून्य-शंसिनी (śūnya-śaṁsinī) - proclaiming emptiness/formlessness

(adjective)

Nominative, feminine, singular of śūnya-śaṃsin

śūnya-śaṁsin - one who proclaims emptiness/void/formlessness

Compound type : tatpuruṣa (śūnya+śaṃsin)

• śūnya – empty, void, null, formless
  adjective
• śaṃsin – proclaiming, indicating, telling
  adjective (masculine)
  agent noun derived from root śaṃs
  Root: śaṃs (class 1)

आधावति (ādhāvati) - runs towards, rushes towards

(verb)

3rd person , singular, active, present (laṭ) of ā + dhāv

Prefix: ā

Root: dhāv (class 1)

स्पन्द-फलम् (spanda-phalam) - result of vibration/activity

(noun)

Accusative, neuter, singular of spanda-phala

spanda-phala - the result or fruit of vibration/activity

Compound type : tatpuruṣa (spanda+phala)

• spanda – vibration, movement, throb
  noun (masculine)
  Root: spand (class 1)
• phala – fruit, result, consequence, outcome
  noun (neuter)

तदा (tadā) - then

(indeclinable)

कर्म (karma) - action, deed

(noun)

Nominative, neuter, singular of karman

karman - action, deed, work, ritual, fate (karma)

Root: kṛ (class 8)

इति (iti) - thus, as

(indeclinable)

Note: Used to introduce a quotation or definition

उदाहृता (udāhṛtā) - is declared, is spoken of

(adjective)

Nominative, feminine, singular of ud + ā + hṛ

hṛ - to carry, to take, to offer

Past Passive Participle

Prefixes: ud+ā

Root: hṛ (class 1)

Note: Past Passive Participle, agreeing with the implied feminine subject 'yā'