योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-15, verse-16

अवस्तुन्येति सर्गादौ न संभवति कारणम् ।
अतोऽहंत्वादि नास्त्वेववन्ध्यासुत इव क्वचित् ॥ १६ ॥

avastunyeti sargādau na saṃbhavati kāraṇam ,
ato'haṃtvādi nāstvevavandhyāsuta iva kvacit 16

16. avastuni eti sargādau na sambhavati kāraṇam ataḥ
ahaṃtvādi na asti eva vandhyāsuta iva kvacit

16. sargādau avastuni kāraṇam na sambhavati ataḥ
ahaṃtvādi vandhyāsuta iva kvacit eva na asti

16. A cause cannot exist in what is non-existent (or unreal) at the beginning of creation. Therefore, the sense of ego (ahaṃtva) and similar concepts certainly do not exist anywhere, much like a barren woman's son.

Words meanings summery:

• अवस्तुनि (avastuni) - in an unreality, in a non-existent thing

• एति (eti) - comes, exists, goes

• सर्गादौ (sargādau) - at the beginning of creation

• न (na) - not, no

• सम्भवति (sambhavati) - is possible, exists

• कारणम् (kāraṇam) - cause

• अतः (ataḥ) - therefore, from this

• अहंत्वादि (ahaṁtvādi) - the sense of 'I' (ahaṃtva) and so on, egoism, etc.

• न (na) - not, no

• अस्ति (asti) - is, exists

• एव (eva) - indeed, certainly

• वन्ध्यासुत (vandhyāsuta) - son of a barren woman

• इव (iva) - like, just as

• क्वचित् (kvacit) - anywhere, sometimes

Words meanings and morphology

अवस्तुनि (avastuni) - in an unreality, in a non-existent thing

(noun)

Locative, neuter, singular of avastu

avastu - unreality, non-existent thing, what is not real

Compound type : nañ-tatpuruṣa (a+vastu)

• a – not, non
  indeclinable
• vastu – thing, object, reality
  noun (neuter)

एति (eti) - comes, exists, goes

(verb)

3rd person , singular, active, present indicative (lat) of i

Root: i (class 2)

सर्गादौ (sargādau) - at the beginning of creation

(noun)

Locative, masculine, singular of sargādi

sargādi - beginning of creation

Compound type : tatpuruṣa (sarga+ādi)

• sarga – creation, emission
  noun (masculine)
• ādi – beginning, et cetera
  noun (masculine)

न (na) - not, no

(indeclinable)

सम्भवति (sambhavati) - is possible, exists

(verb)

3rd person , singular, active, present indicative (lat) of sambhav

Prefix: sam

Root: bhū (class 1)

कारणम् (kāraṇam) - cause

(noun)

Nominative, neuter, singular of kāraṇa

kāraṇa - cause, reason, instrument

अतः (ataḥ) - therefore, from this

(indeclinable)

अहंत्वादि (ahaṁtvādi) - the sense of 'I' (ahaṃtva) and so on, egoism, etc.

(noun)

Nominative, neuter, singular of ahaṃtvādi

ahaṁtvādi - egoism, sense of 'I', etc.

Compound type : tatpuruṣa (ahaṃtva+ādi)

• ahaṃtva – the state of 'I', ego-sense
  noun (neuter)
  Derived from 'aham' (I) with suffix 'tva'
• ādi – beginning, and so on, etc.
  noun (masculine)

न (na) - not, no

(indeclinable)

अस्ति (asti) - is, exists

(verb)

3rd person , singular, active, present indicative (lat) of as

Root: as (class 2)

एव (eva) - indeed, certainly

(indeclinable)

वन्ध्यासुत (vandhyāsuta) - son of a barren woman

(noun)

Nominative, masculine, singular of vandhyāsuta

vandhyāsuta - son of a barren woman, a non-existent thing (figurative)

Compound type : ṣaṣṭhī-tatpuruṣa (vandhyā+suta)

• vandhyā – barren woman
  noun (feminine)
• suta – son
  noun (masculine)
  Past Passive Participle
  From root 'sū' (to beget)
  Root: sū (class 2)

इव (iva) - like, just as

(indeclinable)

क्वचित् (kvacit) - anywhere, sometimes

(indeclinable)