योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-36, verse-20

वेदवेदान्तसिद्धान्ततर्कपौराणगीतिभिः ।
यो गीतः स कथं ह्यात्मा विज्ञातो याति विस्मृतिं ॥ २० ॥

vedavedāntasiddhāntatarkapaurāṇagītibhiḥ ,
yo gītaḥ sa kathaṃ hyātmā vijñāto yāti vismṛtiṃ 20

20. vedavedāntasiddhāntatarkapaurāṇagītibhiḥ yaḥ
gītaḥ saḥ kathaṃ hi ātmā vijñātaḥ yāti vismṛtiṃ

20. vedavedāntasiddhāntatarkapaurāṇagītibhiḥ yaḥ ātmā gītaḥ,
saḥ vijñātaḥ hi kathaṃ vismṛtiṃ yāti

20. That self (ātman), which is indeed sung (gītaḥ) by the hymns of the Vedas, Vedānta, established doctrines (siddhānta), logic (tarka), and Purāṇas—how can such a self (ātman), once truly known, fall into oblivion?

Words meanings summery:

• वेदवेदान्तसिद्धान्ततर्कपौराणगीतिभिः (vedavedāntasiddhāntatarkapaurāṇagītibhiḥ) - by the hymns/songs of Veda, Vedānta, Siddhānta, logic, and Purāṇas

• यः (yaḥ) - who, which

• गीतः (gītaḥ) - sung, praised, chanted

• सः (saḥ) - that, he

• कथं (kathaṁ) - how, in what manner

• हि (hi) - indeed, surely, certainly

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

• विज्ञातः (vijñātaḥ) - known, understood, comprehended

• याति (yāti) - goes, proceeds, attains, reaches

• विस्मृतिं (vismṛtiṁ) - oblivion, forgetfulness, loss of memory

Words meanings and morphology

वेदवेदान्तसिद्धान्ततर्कपौराणगीतिभिः (vedavedāntasiddhāntatarkapaurāṇagītibhiḥ) - by the hymns/songs of Veda, Vedānta, Siddhānta, logic, and Purāṇas

(noun)

Instrumental, feminine, plural of vedavedāntasiddhāntatarkapaurāṇagīti

vedavedāntasiddhāntatarkapaurāṇagīti - hymns related to Veda, Vedānta, Siddhānta, Tarka, and Purāṇas

Compound type : Tatpuruṣa (vedavedāntasiddhāntatarkapaurāṇa+gīti)

• vedavedāntasiddhāntatarkapaurāṇa – Veda, Vedānta, Siddhānta, Tarka, and Purāṇa
  noun (masculine)
• gīti – song, hymn, chant
  noun (feminine)
  Root: gai (class 1)

यः (yaḥ) - who, which

(pronoun)

Nominative, masculine, singular of yat

yat - which, who, what, whatever

गीतः (gītaḥ) - sung, praised, chanted

(adjective)

Nominative, masculine, singular of gīta

gīta - sung, chanted, recited, praised

Past Passive Participle

Derived from root gai (to sing).

Root: gai (class 1)

सः (saḥ) - that, he

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

कथं (kathaṁ) - how, in what manner

(indeclinable)

हि (hi) - indeed, surely, certainly

(indeclinable)

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

(noun)

Nominative, masculine, singular of ātman

ātman - self, soul, spirit, essence, breath

Root: an (class 2)

विज्ञातः (vijñātaḥ) - known, understood, comprehended

(adjective)

Nominative, masculine, singular of vijñāta

vijñāta - known, understood, perceived, recognized

Past Passive Participle

Derived from root jñā (to know) with upasarga vi.

Prefix: vi

Root: jñā (class 9)

याति (yāti) - goes, proceeds, attains, reaches

(verb)

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

Root: yā (class 2)

विस्मृतिं (vismṛtiṁ) - oblivion, forgetfulness, loss of memory

(noun)

Accusative, feminine, singular of vismṛti

vismṛti - forgetfulness, oblivion, loss of memory, error

Derived from root smṛ (to remember) with upasarga vi (indicating separation or negation).

Prefix: vi

Root: smṛ (class 1)