योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-53, verse-26

असंकल्पनमात्रेण स्वेनेवाशु विनश्यति ।
श्रेयसे परमायस्य नाशत्वेन तु संभवः ॥ २६ ॥

asaṃkalpanamātreṇa svenevāśu vinaśyati ,
śreyase paramāyasya nāśatvena tu saṃbhavaḥ 26

26. asaṃkalpanamātreṇa svena iva āśu vinaśyati
śreyase paramāya asya nāśatvena tu saṃbhavaḥ

26. asaṃkalpanamātreṇa āśu svena iva vinaśyati,
tu asya nāśatvena paramāya śreyase saṃbhavaḥ

26. Merely by the absence of intention (saṃkalpa), it quickly perishes by itself. Yet, for the supreme welfare (śreyas), its true existence (saṃbhava) arises through its destruction.

Words meanings summery:

• असंकल्पनमात्रेण (asaṁkalpanamātreṇa) - merely by the absence of intention/conception, by non-conception alone

• स्वेन (svena) - by oneself, by its own

• इव (iva) - like, as, as if

• आशु (āśu) - quickly, swiftly, instantly

• विनश्यति (vinaśyati) - it perishes, it is destroyed, it vanishes

• श्रेयसे (śreyase) - for the highest good, for the welfare

• परमाय (paramāya) - for the supreme, highest (modifying śreyase) (for the supreme)

• अस्य (asya) - of this, its

• नाशत्वेन (nāśatvena) - by means of destruction, as destruction

• तु (tu) - but, on the other hand, however

• संभवः (saṁbhavaḥ) - true existence, being (existence, origin, birth, possibility)

Words meanings and morphology

असंकल्पनमात्रेण (asaṁkalpanamātreṇa) - merely by the absence of intention/conception, by non-conception alone

(noun)

Instrumental, neuter, singular of asaṃkalpanamātra

asaṁkalpanamātra - merely non-conception, solely the absence of intention

Compound of a (negation) + saṃkalpana (conception) + mātra (mere).

Compound type : tatpuruṣa (a+saṃkalpana+mātra)

• a – not, non-
  indeclinable
  Negative prefix
• saṃkalpana – conception, intention, thought, resolve
  noun (neuter)
  Verbal noun
  From root kḷp with prefix sam
  Prefix: sam
  Root: kḷp (class 10)
• mātra – mere, only, measure
  adjective

Note: Functions adverbially.

स्वेन (svena) - by oneself, by its own

(pronoun)

Instrumental, masculine, singular of sva

sva - oneself, one's own, self, one's own property

इव (iva) - like, as, as if

(indeclinable)

Particle of comparison.

आशु (āśu) - quickly, swiftly, instantly

(indeclinable)

Adverbial use of an adjective.

Note: Adverb modifying vinaśyati.

विनश्यति (vinaśyati) - it perishes, it is destroyed, it vanishes

(verb)

3rd person , singular, active, present (laṭ) of vi-naś

vi (prefix) + naś (root) + ya (class 4 sign) + ti (3rd singular present active ending)

Prefix: vi

Root: naś (class 4)

Note: Subject is implicitly the saṃkalpa or saṃkalpitaṃ vastu.

श्रेयसे (śreyase) - for the highest good, for the welfare

(noun)

Dative, neuter, singular of śreyas

śreyas - good, excellence, welfare, highest good, bliss

Comparative form of śrī (beauty, wealth) or praśasya (praiseworthy).

Note: Functions as purpose.

परमाय (paramāya) - for the supreme, highest (modifying śreyase) (for the supreme)

(adjective)

Dative, neuter, singular of parama

parama - highest, supreme, ultimate, excellent

Superlative of para.

अस्य (asya) - of this, its

(pronoun)

Genitive, neuter, singular of idam

idam - this, this one

Note: Possessive, referring to the saṃkalpa whose destruction leads to existence.

नाशत्वेन (nāśatvena) - by means of destruction, as destruction

(noun)

Instrumental, neuter, singular of nāśatva

nāśatva - state of destruction, destructibility, destruction itself

From nāśa (destruction) + tva (suffix meaning 'state of being').

Note: Means "through/by means of destruction".

तु (tu) - but, on the other hand, however

(indeclinable)

Conjunction.

संभवः (saṁbhavaḥ) - true existence, being (existence, origin, birth, possibility)

(noun)

Nominative, masculine, singular of saṃbhava

saṁbhava - birth, origin, production, existence, possibility, occurrence

From sam-bhū (to be together, to be possible, to be produced).

Prefix: sam

Root: bhū (class 1)

Note: The core idea is that the "true being" arises when saṃkalpa is destroyed.