योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-171, verse-19

रूपालोकमनस्कारा एतदेव पदं विदुः ।
एते ते द्रवतावर्ताः पदस्यास्य महाम्भसः ॥ १९ ॥

rūpālokamanaskārā etadeva padaṃ viduḥ ,
ete te dravatāvartāḥ padasyāsya mahāmbhasaḥ 19

19. rūpālokamanaskārāḥ etat eva padam viduḥ ete
te dravatāvartāḥ padasya asya mahāmbhasaḥ

19. rūpālokamanaskārāḥ etat eva padam viduḥ ete
te asya mahāmbhasaḥ padasya dravatāvartāḥ

19. The wise know that perceptions of forms and mental activities are themselves this very state. These (perceptions and activities) are like fluid whirlpools within this great ocean-like state.

Words meanings summery:

• रूपालोकमनस्काराः (rūpālokamanaskārāḥ) - perceptions of forms and mental activities

• एतत् (etat) - this, that

• एव (eva) - only, just, indeed, very

• पदम् (padam) - state, condition (supreme state) (state, condition, abode, word, foot)

• विदुः (viduḥ) - they know

• एते (ete) - these

• ते (te) - those

• द्रवतावर्ताः (dravatāvartāḥ) - whirlpools of fluidity

• पदस्य (padasya) - of the state/condition/abode

• अस्य (asya) - of this

• महाम्भसः (mahāmbhasaḥ) - like a great ocean (of a great ocean, of great water)

Words meanings and morphology

रूपालोकमनस्काराः (rūpālokamanaskārāḥ) - perceptions of forms and mental activities

(noun)

Nominative, masculine, plural of rūpālokamanaskāra

rūpālokamanaskāra - perceptions of forms and mental activities

Compound type : dvandva (rūpāloka+manaskāra)

• rūpāloka – perception/seeing of forms
  noun (masculine)
• manaskāra – mental activity, attention, thought
  noun (masculine)
  Derived from manas + √kṛ
  Root: kṛ (class 8)

एतत् (etat) - this, that

(pronoun)

Nominative, neuter, singular of etad

etad - this

एव (eva) - only, just, indeed, very

(indeclinable)

पदम् (padam) - state, condition (supreme state) (state, condition, abode, word, foot)

(noun)

Accusative, neuter, singular of pada

pada - foot, step, trace, mark, state, condition, abode, word

विदुः (viduḥ) - they know

(verb)

3rd person , plural, active, present (laṭ) of vid

Root: vid (class 2)

एते (ete) - these

(pronoun)

Nominative, masculine, plural of etad

etad - this

Note: Refers to rūpālokamanaskārāḥ.

ते (te) - those

(pronoun)

Nominative, masculine, plural of tad

tad - that, those

Note: Correlative pronoun.

द्रवतावर्ताः (dravatāvartāḥ) - whirlpools of fluidity

(noun)

Nominative, masculine, plural of dravatāvartā

dravatāvartā - whirlpools of fluidity

Compound type : tatpuruṣa (dravatā+āvarta)

• dravatā – fluidity, liquidness
  noun (feminine)
  Derived from 'drava' (liquid) + -tā (abstract noun suffix)
• āvarta – whirlpool, eddy, convolution
  noun (masculine)
  Prefix: ā
  Root: vṛt (class 1)

पदस्य (padasya) - of the state/condition/abode

(noun)

Genitive, neuter, singular of pada

pada - foot, step, trace, mark, state, condition, abode, word

Note: Refers to the 'state' mentioned earlier.

अस्य (asya) - of this

(pronoun)

Genitive, neuter, singular of idam

idam - this

Note: Agrees with padasya.

महाम्भसः (mahāmbhasaḥ) - like a great ocean (of a great ocean, of great water)

(noun)

Genitive, neuter, singular of mahāmbhas

mahāmbhas - great water, great ocean

Compound type : karmadhāraya (mahā+ambhas)

• mahā – great, large
  adjective
• ambhas – water, ocean
  noun (neuter)

Note: Used here as an adjective or apposition to describe the 'state'.