योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-90, verse-4

तज्ज्ञो भवसि शास्त्रेषु रविर्मेरुतटेष्विव ।
तत्त्वज्ञाने तु विश्रान्तो न त्वं दृषदिवाम्भसि ॥ ४ ॥

tajjño bhavasi śāstreṣu ravirmerutaṭeṣviva ,
tattvajñāne tu viśrānto na tvaṃ dṛṣadivāmbhasi 4

4. tatjñaḥ bhavasi śāstreṣu raviḥ merutaṭeṣu iva
tattvajñāne tu viśrāntaḥ na tvam dṛṣadi iva ambhasi

4. tvam śāstreṣu tatjñaḥ bhavasi raviḥ merutaṭeṣu iva
tu tattvajñāne tvam na viśrāntaḥ dṛṣadi iva ambhasi

4. You are indeed knowledgeable in the scriptures, shining like the sun upon the slopes of Mount Meru. However, in the knowledge of ultimate reality, you are not deeply absorbed, unlike a rock that fully submerges in water.

Words meanings summery:

• तत्ज्ञः (tatjñaḥ) - Knowing the scriptures, as referred to in the previous verse. (knowing that, expert in that)

• भवसि (bhavasi) - you are, you become

• शास्त्रेषु (śāstreṣu) - in the scriptures

• रविः (raviḥ) - the sun

• मेरुतटेषु (merutaṭeṣu) - on the slopes of Meru

• इव (iva) - like, as, as if

• तत्त्वज्ञाने (tattvajñāne) - in the knowledge of ultimate reality

• तु (tu) - but, indeed, on the other hand

• विश्रान्तः (viśrāntaḥ) - Deeply absorbed or settled in knowledge. (at rest, absorbed, settled, immersed)

• न (na) - not, no

• त्वम् (tvam) - you

• दृषदि (dṛṣadi) - Here, 'like a rock' (which sinks). (on/in a rock)

• इव (iva) - like, as, as if

• अम्भसि (ambhasi) - in water

Words meanings and morphology

तत्ज्ञः (tatjñaḥ) - Knowing the scriptures, as referred to in the previous verse. (knowing that, expert in that)

(adjective)

Nominative, masculine, singular of tatjña

tatjña - knowing that, expert in that

Compound type : tatpuruṣa (tad+jña)

• tad – that
  pronoun (neuter)
• jña – knowing, knowledgeable
  adjective (masculine)
  From root jñā (to know)
  Root: jñā (class 9)

Note: Refers to the king, connecting to the skill in śāstrārtha mentioned in the previous verse.

भवसि (bhavasi) - you are, you become

(verb)

2nd person , singular, active, present (laṭ) of bhū

Root: bhū (class 1)

शास्त्रेषु (śāstreṣu) - in the scriptures

(noun)

Locative, neuter, plural of śāstra

śāstra - scripture, sacred text, treatise

रविः (raviḥ) - the sun

(noun)

Nominative, masculine, singular of ravi

ravi - the sun

मेरुतटेषु (merutaṭeṣu) - on the slopes of Meru

(noun)

Locative, masculine, plural of merutaṭa

merutaṭa - slopes/banks of Mount Meru

Compound type : tatpuruṣa (meru+taṭa)

• meru – Mount Meru (mythical mountain)
  proper noun (masculine)
• taṭa – slope, bank, shore
  noun (masculine)

इव (iva) - like, as, as if

(indeclinable)

तत्त्वज्ञाने (tattvajñāne) - in the knowledge of ultimate reality

(noun)

Locative, neuter, singular of tattvajñāna

tattvajñāna - knowledge of truth/reality/principles

Compound type : tatpuruṣa (tattva+jñāna)

• tattva – truth, reality, principle
  noun (neuter)
• jñāna – knowledge
  noun (neuter)
  Root: jñā (class 9)

तु (tu) - but, indeed, on the other hand

(indeclinable)

Note: Introduces a contrast.

विश्रान्तः (viśrāntaḥ) - Deeply absorbed or settled in knowledge. (at rest, absorbed, settled, immersed)

(adjective)

Nominative, masculine, singular of viśrānta

viśrānta - at rest, ceased, calm, absorbed, immersed

Past Passive Participle

from root śram (to be weary) with prefix vi; or root śrā (to ripen, to cook) with prefix vi. Here more likely śram.

Prefix: vi

Root: śram (class 4)

Note: Qualifies 'tvam'.

न (na) - not, no

(indeclinable)

Note: Negates 'viśrāntaḥ'.

त्वम् (tvam) - you

(pronoun)

Nominative, singular of yuṣmad

yuṣmad - you

दृषदि (dṛṣadi) - Here, 'like a rock' (which sinks). (on/in a rock)

(noun)

Locative, feminine, singular of dṛṣad

dṛṣad - rock, stone

इव (iva) - like, as, as if

(indeclinable)

अम्भसि (ambhasi) - in water

(noun)

Locative, neuter, singular of ambhas

ambhas - water