योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-61, verse-28

संभवोऽसंभवः सम्यक् सिद्धये स्वप्नविभ्रमः ।
न तदस्ति न यत्सत्यं न तदस्ति न यन्मृषा ॥ २८ ॥

saṃbhavo'saṃbhavaḥ samyak siddhaye svapnavibhramaḥ ,
na tadasti na yatsatyaṃ na tadasti na yanmṛṣā 28

28. saṃbhavaḥ asaṃbhavaḥ samyak siddhaye svapnavibhramaḥ | na
tat asti na yat satyam na tat asti na yat mṛṣā || 28 ||

28. saṃbhavaḥ asaṃbhavaḥ samyak siddhaye svapnavibhramaḥ
yat satyam na tat na asti yat mṛṣā na tat na asti 28

28. Existence (saṃbhava) and non-existence (asaṃbhava), for perfect realization (siddhaye), are like a dream-illusion (svapnavibhrama). There is nothing that is not true, nor anything that is not false.

Words meanings summery:

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

• असंभवः (asaṁbhavaḥ) - non-existence (impossibility, non-existence, unlikelihood)

• सम्यक् (samyak) - for perfect (properly, correctly, completely, truly, perfectly)

• सिद्धये (siddhaye) - for realization (for accomplishment, for success, for realization)

• स्वप्नविभ्रमः (svapnavibhramaḥ) - dream-illusion (dream-illusion, dream-error, confusion of a dream)

• न (na) - not (not, no)

• तत् (tat) - that (referring to "anything") (that, it)

• अस्ति (asti) - exists (is, exists)

• न (na) - not (not, no)

• यत् (yat) - which (which, what)

• सत्यम् (satyam) - true (true, real; truth, reality)

• न (na) - not (not, no)

• तत् (tat) - that (referring to "anything") (that, it)

• अस्ति (asti) - exists (is, exists)

• न (na) - nor (not, no)

• यत् (yat) - which (which, what)

• मृषा (mṛṣā) - false (falsely, vainly, untruly; falsehood)

Words meanings and morphology

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

(noun)

Nominative, masculine, singular of saṃbhava

saṁbhava - birth, origin, possibility, existence

From root `bhū` with `sam` prefix

Prefix: sam

Root: bhū (class 1)

असंभवः (asaṁbhavaḥ) - non-existence (impossibility, non-existence, unlikelihood)

(noun)

Nominative, masculine, singular of asaṃbhava

asaṁbhava - impossibility, non-existence; impossible

Compound of `a` (negation) and `saṃbhava` (possibility)

Compound type : nan-tatpurusha (a+saṃbhava)

• a – not, un-
  indeclinable
  Negative prefix
• saṃbhava – birth, origin, possibility, existence
  noun (masculine)
  From root `bhū` with `sam` prefix
  Prefix: sam
  Root: bhū (class 1)

सम्यक् (samyak) - for perfect (properly, correctly, completely, truly, perfectly)

(indeclinable)

From `sam-añc` (to go together, to be complete)

Note: Adverb modifying `siddhaye`.

सिद्धये (siddhaye) - for realization (for accomplishment, for success, for realization)

(noun)

Dative, feminine, singular of siddhi

siddhi - accomplishment, success, perfection, realization, supernatural power

From root `sidh`

Root: sidh (class 1)

स्वप्नविभ्रमः (svapnavibhramaḥ) - dream-illusion (dream-illusion, dream-error, confusion of a dream)

(noun)

Nominative, masculine, singular of svapnavibhrama

svapnavibhrama - dream-illusion, error of a dream

Compound type : tatpurusha (svapna+vibhrama)

• svapna – sleep, dream
  noun (masculine)
• vibhrama – illusion, error, confusion, wandering
  noun (masculine)
  From root `bhram` with `vi` prefix
  Prefix: vi
  Root: bhram (class 1)

न (na) - not (not, no)

(indeclinable)

तत् (tat) - that (referring to "anything") (that, it)

(pronoun)

Nominative, neuter, singular of tad

tad - that, it, he, she

अस्ति (asti) - exists (is, exists)

(verb)

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

Root: as (class 2)

न (na) - not (not, no)

(indeclinable)

यत् (yat) - which (which, what)

(pronoun)

Nominative, neuter, singular of yad

yad - which, what, who

Note: Relative pronoun.

सत्यम् (satyam) - true (true, real; truth, reality)

(adjective)

Nominative, neuter, singular of satya

satya - truth, reality; true, real

न (na) - not (not, no)

(indeclinable)

तत् (tat) - that (referring to "anything") (that, it)

(pronoun)

Nominative, neuter, singular of tad

tad - that, it, he, she

अस्ति (asti) - exists (is, exists)

(verb)

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

Root: as (class 2)

न (na) - nor (not, no)

(indeclinable)

यत् (yat) - which (which, what)

(pronoun)

Nominative, neuter, singular of yad

yad - which, what, who

Note: Relative pronoun.

मृषा (mṛṣā) - false (falsely, vainly, untruly; falsehood)

(indeclinable)