योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-36, verse-54

त्वद्वशादियमात्मीया वाचा संप्रविलीयते ।
दीपवत्पुनरन्यत्र समुदेति कुतोऽपि सा ॥ ५४ ॥

tvadvaśādiyamātmīyā vācā saṃpravilīyate ,
dīpavatpunaranyatra samudeti kuto'pi sā 54

54. tvadvaśāt iyam ātmīyā vācā saṃpravilīyate
dīpavat punaḥ anyatra samudeti kutaḥ api sā

54. tvadvaśāt iyam ātmīyā vācā saṃpravilīyate
punaḥ dīpavat sā anyatra kutaḥ api samudeti

54. By your power, this power of speech (vācā) belonging to one's own self completely dissolves. Then, like a lamp, it arises again from some other source.

Words meanings summery:

• त्वद्वशात् (tvadvaśāt) - by your power, by your control, owing to you

• इयम् (iyam) - this (feminine singular)

• आत्मीया (ātmīyā) - one's own, personal, belonging to the self (ātman)

• वाचा (vācā) - power of speech (speech, voice, word)

• संप्रविलीयते (saṁpravilīyate) - dissolves completely, merges entirely, disappears

• दीपवत् (dīpavat) - like a lamp, similar to a lamp

• पुनः (punaḥ) - again, furthermore, but

• अन्यत्र (anyatra) - elsewhere, in another place

• समुदेति (samudeti) - arises, emerges, comes forth

• कुतः (kutaḥ) - from where, whence, from some source

• अपि (api) - with kutaḥ, it means "from somewhere" (even, also, indeed)

• सा (sā) - referring to vācā (she, that (feminine singular))

Words meanings and morphology

त्वद्वशात् (tvadvaśāt) - by your power, by your control, owing to you

(noun)

Ablative, masculine, singular of tvadvaśa

tvadvaśa - your power/control

Compound type : tatpuruṣa (tvad+vaśa)

• tvad – your (stem for yuṣmad)
  pronoun
• vaśa – power, control, will
  noun (masculine)

इयम् (iyam) - this (feminine singular)

(pronoun)

Nominative, feminine, singular of idam

idam - this

आत्मीया (ātmīyā) - one's own, personal, belonging to the self (ātman)

(adjective)

Nominative, feminine, singular of ātmīya

ātmīya - one's own, personal, belonging to the self (ātman)

Derived from ātman with suffix -īya

वाचा (vācā) - power of speech (speech, voice, word)

(noun)

Nominative, feminine, singular of vāc

vāc - speech, voice, word, language

Root: vac (class 2)

संप्रविलीयते (saṁpravilīyate) - dissolves completely, merges entirely, disappears

(verb)

3rd person , singular, middle, present (laṭ) of lī

Prefixes: sam+pra+vi

Root: lī (class 4)

दीपवत् (dīpavat) - like a lamp, similar to a lamp

(indeclinable)

Taddhita suffix -vat (similarity) added to dīpa

पुनः (punaḥ) - again, furthermore, but

(indeclinable)

अन्यत्र (anyatra) - elsewhere, in another place

(indeclinable)

Taddhita suffix -tra (locative sense) from anya

समुदेति (samudeti) - arises, emerges, comes forth

(verb)

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

Prefixes: sam+ud

Root: i (class 2)

कुतः (kutaḥ) - from where, whence, from some source

(indeclinable)

अपि (api) - with kutaḥ, it means "from somewhere" (even, also, indeed)

(indeclinable)

सा (sā) - referring to vācā (she, that (feminine singular))

(pronoun)

Nominative, feminine, singular of tad

tad - that, she, it