योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-113, verse-18

शुद्धश्चिन्मात्र आत्मायमाकाशादप्यणोरणुः ।
स्वानुभूत्यंशमात्रं हि खवद्राम न नश्यति ॥ १८ ॥

śuddhaścinmātra ātmāyamākāśādapyaṇoraṇuḥ ,
svānubhūtyaṃśamātraṃ hi khavadrāma na naśyati 18

18. śuddhaḥ cit-mātraḥ ātmā ayam ākāśāt api aṇoḥ aṇuḥ |
sva-anubhūti-aṃśa-mātram hi kha-vat rāma na naśyati || 18 ||

18. rāma,
ayam śuddhaḥ cit-mātraḥ aṇoḥ api ākāśāt aṇuḥ ātmā,
hi sva-anubhūti-aṃśa-mātram kha-vat na naśyati.

18. This pure, consciousness-only (cit-mātra) Self (ātman) is subtler than even the subtle ether; it is merely a part of one's own direct experience and, like space, O Rama, it truly does not perish.

Words meanings summery:

• शुद्धः (śuddhaḥ) - pure (spiritually, unmixed) (pure, clean, clear, unblemished)

• चित्-मात्रः (cit-mātraḥ) - consciousness-only (consisting only of consciousness, mere consciousness)

• आत्मा (ātmā) - the Self (ātman) (the Self, soul, spirit)

• अयम् (ayam) - this (this, this one)

• आकाशात् (ākāśāt) - from ether (from space, from ether, from the sky)

• अपि (api) - even (even, also, too)

• अणोः (aṇoḥ) - than the subtle (from the subtle, than the subtle, of the subtle)

• अणुः (aṇuḥ) - subtler (subtle, minute, an atom)

• स्व-अनुभूति-अंश-मात्रम् (sva-anubhūti-aṁśa-mātram) - merely a part of one's own direct experience (merely a part of one's own experience)

• हि (hi) - truly, indeed (indeed, certainly, because)

• ख-वत् (kha-vat) - like space (like space, like ether)

• राम (rāma) - O Rama

• न (na) - not (not, no)

• नश्यति (naśyati) - does not perish (perishes, is destroyed, disappears)

Words meanings and morphology

शुद्धः (śuddhaḥ) - pure (spiritually, unmixed) (pure, clean, clear, unblemished)

(adjective)

Nominative, masculine, singular of śuddha

śuddha - pure, clean, clear, unblemished

Past Passive Participle

Derived from root śudh (to purify) + kta

Root: śudh (class 4)

चित्-मात्रः (cit-mātraḥ) - consciousness-only (consisting only of consciousness, mere consciousness)

(adjective)

Nominative, masculine, singular of cit-mātra

cit-mātra - consisting only of consciousness, mere consciousness

Compound type : bahuvrīhi (cit+mātra)

• cit – consciousness, thought, understanding
  noun (feminine)
• mātra – only, mere, consisting of
  adjective

आत्मा (ātmā) - the Self (ātman) (the Self, soul, spirit)

(noun)

Nominative, masculine, singular of ātman

ātman - the Self, soul, spirit, essence

Note: Used in translation.

अयम् (ayam) - this (this, this one)

(pronoun)

Nominative, masculine, singular of idam

idam - this, this one

Note: Masculine nominative singular of idam.

आकाशात् (ākāśāt) - from ether (from space, from ether, from the sky)

(noun)

Ablative, masculine, singular of ākāśa

ākāśa - space, ether, sky

Prefix: ā

Root: kāś (class 1)

अपि (api) - even (even, also, too)

(indeclinable)

अणोः (aṇoḥ) - than the subtle (from the subtle, than the subtle, of the subtle)

(adjective)

Ablative, masculine, singular of aṇu

aṇu - subtle, minute, atom

Note: Used in comparative sense with 'api'.

अणुः (aṇuḥ) - subtler (subtle, minute, an atom)

(adjective)

Nominative, masculine, singular of aṇu

aṇu - subtle, minute, atom

Note: It's the predicate adjective, modified by the ablative 'aṇoḥ'.

स्व-अनुभूति-अंश-मात्रम् (sva-anubhūti-aṁśa-mātram) - merely a part of one's own direct experience (merely a part of one's own experience)

(adjective)

Nominative, neuter, singular of sva-anubhūti-aṃśa-mātra

sva-anubhūti-aṁśa-mātra - merely a part of one's own experience

Compound type : tatpuruṣa (sva+anubhūti+aṃśa+mātra)

• sva – one's own
  pronoun
• anubhūti – experience, perception
  noun (feminine)
  Prefix: anu
• aṃśa – part, portion
  noun (masculine)
• mātra – only, mere, consisting of
  adjective

Note: It qualifies the implicit subject (ātman).

हि (hi) - truly, indeed (indeed, certainly, because)

(indeclinable)

Note: Emphatic particle.

ख-वत् (kha-vat) - like space (like space, like ether)

(indeclinable)

Suffix -vat (like, similar to)

Compound type : indeclinable compound (kha+vat)

• kha – space, ether, sky
  noun (neuter)
• vat – like, similar to
  suffix
  Taddhita suffix -vat, forming adverbs/adjectives

Note: Used as an adverbial comparison.

राम (rāma) - O Rama

(proper noun)

Vocative, masculine, singular of rāma

rāma - Rama (proper name), pleasing, dark

Note: Addressing Rama.

न (na) - not (not, no)

(indeclinable)

Note: Negation.

नश्यति (naśyati) - does not perish (perishes, is destroyed, disappears)

(verb)

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

Present Active Indicative

Root naś (class 4) + -ya- (vikaraṇa) + ti (ending)

Root: naś (class 4)

Note: Verb for the Self (ātman).