योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-148, verse-8

स्वप्नोऽयं सत्य इत्यन्तर्निश्चयेन तथोदिता ।
तथैवाशु भवत्येषा संशयात्संशयं व्रजेत् ॥ ८ ॥

svapno'yaṃ satya ityantarniścayena tathoditā ,
tathaivāśu bhavatyeṣā saṃśayātsaṃśayaṃ vrajet 8

8. svapnaḥ ayam satyaḥ iti antar niścayena tathā uditā
tathā eva āśu bhavati eṣā saṃśayāt saṃśayam vrajet

8. ayam svapnaḥ satyaḥ iti antar niścayena tathā uditā,
eṣā tathā eva āśu bhavati.
(cet na) saṃśayāt saṃśayam vrajet

8. If, with an inner conviction, one holds that "this dream is real," then that (dream-belief) quickly manifests as such. Otherwise, it merely wanders from one doubt to another.

Words meanings summery:

• स्वप्नः (svapnaḥ) - dream, sleep

• अयम् (ayam) - this, this one

• सत्यः (satyaḥ) - true, real, existing

• इति (iti) - thus, so, in this manner, marking direct speech

• अन्तर् (antar) - within, inside, amidst, internal

• निश्चयेन (niścayena) - by conviction, by certainty, by determination

• तथा (tathā) - thus, so, in that manner, similarly

• उदिता (uditā) - Refers to the 'belief' or 'conviction' which is taken as arisen or declared. (arisen, appeared, declared, spoken)

• तथा (tathā) - thus, so, in that manner, similarly

• एव (eva) - indeed, just, only, exactly

• आशु (āśu) - quickly, swiftly

• भवति (bhavati) - becomes, happens, exists

• एषा (eṣā) - Refers to the dream (or the belief in its truth) that then manifests. (this, this one (feminine))

• संशयात् (saṁśayāt) - from doubt, out of uncertainty

• संशयम् (saṁśayam) - to doubt, into uncertainty

• व्रजेत् (vrajet) - may go, should go, would go

Words meanings and morphology

स्वप्नः (svapnaḥ) - dream, sleep

(noun)

Nominative, masculine, singular of svapna

svapna - sleep, dream, dreaming

Derived from root svap (to sleep).

Root: svap (class 2)

अयम् (ayam) - this, this one

(pronoun)

Nominative, masculine, singular of idam

idam - this, this one

सत्यः (satyaḥ) - true, real, existing

(adjective)

Nominative, masculine, singular of satya

satya - true, real, truth, reality

Derived from sat (being, existing).

Root: as (class 2)

इति (iti) - thus, so, in this manner, marking direct speech

(indeclinable)

अन्तर् (antar) - within, inside, amidst, internal

(indeclinable)

Note: Used as an adverbial modifier to 'niścayena'.

निश्चयेन (niścayena) - by conviction, by certainty, by determination

(noun)

Instrumental, masculine, singular of niścaya

niścaya - firm resolve, conviction, certainty, determination

From ni- + √ci (to collect, observe) + aya.

Prefix: nis

Root: ci (class 5)

तथा (tathā) - thus, so, in that manner, similarly

(indeclinable)

उदिता (uditā) - Refers to the 'belief' or 'conviction' which is taken as arisen or declared. (arisen, appeared, declared, spoken)

(adjective)

Nominative, feminine, singular of udita

udita - risen, appeared, spoken, declared

Past Passive Participle

From ud- + √i (to go) meaning 'risen' or 'appeared', or from ud- + √vad (to speak) meaning 'spoken'/'declared'. Here 'declared' or 'arisen (belief)' fits.

Prefix: ud

Root: i (class 2)

तथा (tathā) - thus, so, in that manner, similarly

(indeclinable)

एव (eva) - indeed, just, only, exactly

(indeclinable)

आशु (āśu) - quickly, swiftly

(indeclinable)

भवति (bhavati) - becomes, happens, exists

(verb)

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

Root: bhū (class 1)

एषा (eṣā) - Refers to the dream (or the belief in its truth) that then manifests. (this, this one (feminine))

(pronoun)

Nominative, feminine, singular of etad

etad - this, this one

संशयात् (saṁśayāt) - from doubt, out of uncertainty

(noun)

Ablative, masculine, singular of saṃśaya

saṁśaya - doubt, uncertainty, suspicion

From sam- + √śī (to lie, doubt).

Prefix: sam

Root: śī (class 2)

संशयम् (saṁśayam) - to doubt, into uncertainty

(noun)

Accusative, masculine, singular of saṃśaya

saṁśaya - doubt, uncertainty, suspicion

From sam- + √śī (to lie, doubt).

Prefix: sam

Root: śī (class 2)

व्रजेत् (vrajet) - may go, should go, would go

(verb)

3rd person , singular, active, optative (vidhiliṅ) of vraj

Root: vraj (class 1)