योगवासिष्ठः yogavāsiṣṭhaḥ - book-2, chapter-13, verse-43

तत्समस्तसुखासारसीमान्तं साधवो विदुः ।
तदनुत्तमनिष्पन्दं परमाहू रसायनम् ॥ ४३ ॥

tatsamastasukhāsārasīmāntaṃ sādhavo viduḥ ,
tadanuttamaniṣpandaṃ paramāhū rasāyanam 43

43. tat samasta-sukhāsāra-sīmāntam sādhavaḥ viduḥ |
tat anuttama-niṣpandam param āhuḥ rasāyanam ||

43. sādhavaḥ tat samasta-sukhāsāra-sīmāntam viduḥ
tat anuttama-niṣpandam param rasāyanam āhuḥ

43. The wise (sādhus) know that [state] as the ultimate peak of the essence of all happiness. They declare that unsurpassed, unwavering tranquility to be the supreme elixir (rasāyanam).

Words meanings summery:

• तत् (tat) - that state (referred to by the wise) (that, it)

• समस्त-सुखासार-सीमान्तम् (samasta-sukhāsāra-sīmāntam) - the ultimate limit of the essence of all happiness, the peak of all joy's essence

• साधवः (sādhavaḥ) - the wise, good people, saints, holy men

• विदुः (viduḥ) - they know, they understand

• तत् (tat) - that state (referred to as the elixir) (that, it)

• अनुत्तम-निष्पन्दम् (anuttama-niṣpandam) - unsurpassed tranquility, supreme unwavering state

• परम् (param) - supreme, highest, ultimate

• आहुः (āhuḥ) - they say, they declare, they call

• रसायनम् (rasāyanam) - the ultimate spiritual elixir (elixir, tonic, rejuvenator, chemical)

Words meanings and morphology

तत् (tat) - that state (referred to by the wise) (that, it)

(pronoun)

Accusative, neuter, singular of tad

tad - that, it

समस्त-सुखासार-सीमान्तम् (samasta-sukhāsāra-sīmāntam) - the ultimate limit of the essence of all happiness, the peak of all joy's essence

(noun)

Accusative, neuter, singular of samasta-sukhāsāra-sīmānta

samasta-sukhāsāra-sīmānta - ultimate limit of the essence of all happiness

Compound type : tatpuruṣa (samasta+sukha+asāra+sīmānta)

• samasta – all, entire, whole
  adjective (masculine)
  Past Passive Participle
  From sam-as (to throw, to cast)
  Prefix: sam
  Root: as (class 2)
• sukha – happiness, pleasure, comfort
  noun (neuter)
• asāra – essence, core, pith
  noun (masculine)
  From a + sāra (substance, essence). Here 'asāra' refers to essence, not lack of essence.
  Root: sṛ (class 1)
• sīmānta – boundary, limit, utmost extent, peak
  noun (masculine)

Note: The compound takes the gender and number of its last member 'sīmānta', here neuter singular accusative.

साधवः (sādhavaḥ) - the wise, good people, saints, holy men

(noun)

Nominative, masculine, plural of sādhu

sādhu - good, virtuous, wise, saintly

Root: sādh

विदुः (viduḥ) - they know, they understand

(verb)

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

Root: vid (class 2)

तत् (tat) - that state (referred to as the elixir) (that, it)

(pronoun)

Accusative, neuter, singular of tad

tad - that, it

अनुत्तम-निष्पन्दम् (anuttama-niṣpandam) - unsurpassed tranquility, supreme unwavering state

(noun)

Accusative, neuter, singular of anuttama-niṣpanda

anuttama-niṣpanda - unsurpassed tranquility, supreme steadiness

Compound type : karma-dhāraya (anuttama+niṣpanda)

• anuttama – unsurpassed, unequalled, supreme
  adjective (masculine)
  Prefix: an
• niṣpanda – motionless, unwavering, tranquil, steady
  adjective (masculine)
  Derived from root spand (to tremble, to vibrate) with prefix nis (out, without).
  Prefix: nis
  Root: spand (class 1)

Note: Used here as a noun phrase in the accusative case.

परम् (param) - supreme, highest, ultimate

(adjective)

Accusative, neuter, singular of para

para - supreme, highest, ultimate, excellent, other

Note: Adjectival complement to rasāyanam.

आहुः (āhuḥ) - they say, they declare, they call

(verb)

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

Root: brū (class 2)

रसायनम् (rasāyanam) - the ultimate spiritual elixir (elixir, tonic, rejuvenator, chemical)

(noun)

Accusative, neuter, singular of rasāyana

rasāyana - elixir, tonic, chemistry, alchemy

Formed from rasa (essence, fluid) + ayana (course, path), meaning 'path to essence' or 'rejuvenating substance'.