योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-127, verse-18

तावद्रूढा सुधाकाररसा संविन्महानदी ।
न यावदात्मरूपेण निपुणैरवगाह्यते ॥ १८ ॥

tāvadrūḍhā sudhākārarasā saṃvinmahānadī ,
na yāvadātmarūpeṇa nipuṇairavagāhyate 18

18. tāvat rūḍhā sudhākararasā saṃvit mahānadī
na yāvat ātmarūpeṇa nipuṇaiḥ avagāhyate

18. sudhākararasā saṃvit mahānadī tāvat rūḍhā
na yāvat nipuṇaiḥ ātmarūpeṇa avagāhyate

18. The great river of consciousness (saṃvid), whose essence (rasa) is like nectar, remains firmly established until it is deeply comprehended by the experts (nipuṇaiḥ) as the intrinsic nature of the self (ātman).

Words meanings summery:

• तावत् (tāvat) - so long, to that extent, for so much time

• रूढा (rūḍhā) - firmly established (in its apparent form) (established, firm, grown)

• सुधाकररसा (sudhākararasā) - whose essence is like nectar, having the taste/form of nectar

• संवित् (saṁvit) - consciousness (saṃvid) (consciousness, understanding)

• महानदी (mahānadī) - great river

• न (na) - not, no

• यावत् (yāvat) - until, as long as

• आत्मरूपेण (ātmarūpeṇa) - as the intrinsic nature of the self (ātman) (by the nature of the self, in its true form, as the self)

• निपुणैः (nipuṇaiḥ) - by the skilled, by the experts

• अवगाह्यते (avagāhyate) - is deeply comprehended (is plunged into, is entered, is comprehended)

Words meanings and morphology

तावत् (tāvat) - so long, to that extent, for so much time

(indeclinable)

From tad-root + vatupratyaya.

Note: Correlates with 'yāvat', indicating a duration or extent.

रूढा (rūḍhā) - firmly established (in its apparent form) (established, firm, grown)

(adjective)

Nominative, feminine, singular of rūḍha

rūḍha - ascended, grown, risen, established, conventional, notorious

Past Passive Participle

From √ruh (class 1) + kta suffix.

Root: ruh (class 1)

Note: Agrees with 'saṃvit mahānadī'.

सुधाकररसा (sudhākararasā) - whose essence is like nectar, having the taste/form of nectar

(adjective)

Nominative, feminine, singular of sudhākararasa

sudhākararasa - having the essence of nectar, nectar-like in essence

Compound type : bahuvrīhi (sudhā+ākāra+rasa)

• sudhā – nectar, ambrosia
  noun (feminine)
• ākāra – form, shape, appearance, essence
  noun (masculine)
  From ā-√kṛ.
  Prefix: ā
  Root: kṛ (class 8)
• rasa – essence, juice, taste, flavor, sentiment
  noun (masculine)
  Root: ras (class 1)

Note: Agrees with 'saṃvit mahānadī'.

संवित् (saṁvit) - consciousness (saṃvid) (consciousness, understanding)

(noun)

Nominative, feminine, singular of saṃvid

saṁvid - consciousness, understanding, knowledge, agreement

From sam-√vid.

Prefix: sam

Root: vid (class 2)

Note: Part of the compound subject 'saṃvit mahānadī'.

महानदी (mahānadī) - great river

(noun)

Nominative, feminine, singular of mahānadī

mahānadī - great river

Compound type : karmadhāraya (mahā+nadī)

• mahā – great, large
  adjective (feminine)
  Stem form of mahant.
• nadī – river
  noun (feminine)

Note: Subject of the implied verb 'asti' and 'avagāhyate'.

न (na) - not, no

(indeclinable)

Note: Negative particle, used with 'yāvat'.

यावत् (yāvat) - until, as long as

(indeclinable)

From yad-root + vatupratyaya.

Note: Correlates with 'tāvat'.

आत्मरूपेण (ātmarūpeṇa) - as the intrinsic nature of the self (ātman) (by the nature of the self, in its true form, as the self)

(noun)

Instrumental, neuter, singular of ātmarūpa

ātmarūpa - the nature/form of the self, essential nature

Compound type : tatpuruṣa (ātman+rūpa)

• ātman – self, soul, spirit, essential nature
  noun (masculine)
• rūpa – form, shape, nature, characteristic
  noun (neuter)

Note: Indicates the manner or means 'by means of'.

निपुणैः (nipuṇaiḥ) - by the skilled, by the experts

(adjective)

Instrumental, masculine, plural of nipuṇa

nipuṇa - skillful, clever, expert, able

Note: Agent of the passive verb 'avagāhyate'.

अवगाह्यते (avagāhyate) - is deeply comprehended (is plunged into, is entered, is comprehended)

(verb)

3rd person , singular, passive, present (laṭ) of avagāh

Present Passive

From ava-√gāh (class 1) + ya suffix.

Prefix: ava

Root: gāh (class 1)

Note: The subject is 'saṃvit mahānadī'.