योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-90, verse-6

नेह नानास्ति नो नाना न नास्तित्वं न चास्तिता ।
अहमित्येव नैवास्ति यत्र तत्र कुतोऽस्ति किम् ॥ ६ ॥

neha nānāsti no nānā na nāstitvaṃ na cāstitā ,
ahamityeva naivāsti yatra tatra kuto'sti kim 6

6. na iha nānā asti no nānā na nāstitvam na ca āstitā
aham iti eva na eva asti yatra tatra kutaḥ asti kim

6. iha nānā na asti no nānā na nāstitvam na ca āstitā
yatra aham iti eva na eva asti tatra kutaḥ kim asti

6. Here, there is no diversity; nor is there any other multiplicity. Neither non-existence nor existence (āstitā) is present. Where the concept of 'I' (aham) truly does not exist, how can anything exist there?

Words meanings summery:

• न (na) - not, no

• इह (iha) - here, in this world/context

• नाना (nānā) - diverse, various, multiplicity

• अस्ति (asti) - is, exists

• नो (no) - nor, not even

• नाना (nānā) - diverse, various, multiplicity

• न (na) - not, no

• नास्तित्वम् (nāstitvam) - non-existence, absence

• न (na) - not, no

• च (ca) - and, also

• आस्तिता (āstitā) - existence, presence

• अहम् (aham) - the ego or individual self (I)

• इति (iti) - indicating 'the concept of I' (thus, so, denoting quotation/thought)

• एव (eva) - only, just, indeed

• न (na) - not, no

• अस्ति (asti) - is, exists

• यत्र (yatra) - where, in which case

• तत्र (tatra) - there, in that place/case

• कुतः (kutaḥ) - how is it possible that (from where, how, whence)

• अस्ति (asti) - is, exists

• किम् (kim) - nothing (what, anything)

Words meanings and morphology

न (na) - not, no

(indeclinable)

इह (iha) - here, in this world/context

(indeclinable)

नाना (nānā) - diverse, various, multiplicity

(indeclinable)

Also functions as an adjective/noun

Note: Used here as a noun meaning 'diversity/multiplicity'.

अस्ति (asti) - is, exists

(verb)

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

Present active indicative

From root as (class 2) 'to be'

Root: as (class 2)

नो (no) - nor, not even

(indeclinable)

Short form of 'na u', or an emphatic 'na'

Note: Used for further negation.

नाना (nānā) - diverse, various, multiplicity

(indeclinable)

Also functions as an adjective/noun

Note: Repetition for emphasis on lack of diversity.

न (na) - not, no

(indeclinable)

नास्तित्वम् (nāstitvam) - non-existence, absence

(noun)

Nominative, neuter, singular of nāstitva

nāstitva - non-existence, negation, absence

From 'na' + 'asti' + 'tva' (abstract noun suffix)

Root: as (class 2)

Note: Used in a pair with 'āstitā'.

न (na) - not, no

(indeclinable)

च (ca) - and, also

(indeclinable)

Note: Connects 'nāstitvam' and 'āstitā'.

आस्तिता (āstitā) - existence, presence

(noun)

Nominative, feminine, singular of āstitā

āstitā - existence, being, reality

From 'asti' + 'tā' (abstract noun suffix)

Root: as (class 2)

Note: Used in a pair with 'nāstitvam'.

अहम् (aham) - the ego or individual self (I)

(pronoun)

Nominative, singular of asmad

asmad - I

1st person singular pronoun

Note: Refers to the ego or individual self.

इति (iti) - indicating 'the concept of I' (thus, so, denoting quotation/thought)

(indeclinable)

एव (eva) - only, just, indeed

(indeclinable)

Note: Emphasizes the negation.

न (na) - not, no

(indeclinable)

अस्ति (asti) - is, exists

(verb)

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

Present active indicative

From root as (class 2) 'to be'

Root: as (class 2)

यत्र (yatra) - where, in which case

(indeclinable)

Note: Correlative with 'tatra'.

तत्र (tatra) - there, in that place/case

(indeclinable)

Note: Correlative with 'yatra'.

कुतः (kutaḥ) - how is it possible that (from where, how, whence)

(indeclinable)

Ablative form of 'kim' used adverbially

अस्ति (asti) - is, exists

(verb)

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

Present active indicative

From root as (class 2) 'to be'

Root: as (class 2)

किम् (kim) - nothing (what, anything)

(pronoun)

Nominative, neuter, singular of kim

kim - what, which, who

'kim' (interrogative pronoun)

Note: Subject of the question, implying 'nothing' due to the context of negation.