योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-81, verse-18

प्रविचार्य स्वसंस्थेन स्वस्थेन स्वेन चेतसा ।
तिष्ठन्ति विगतोद्वेगं सन्तः प्रकृतकर्मसु ॥ १८ ॥

pravicārya svasaṃsthena svasthena svena cetasā ,
tiṣṭhanti vigatodvegaṃ santaḥ prakṛtakarmasu 18

18. pravicārya svasaṃsthena svasthena svena cetasā
tiṣṭhanti vigatodvegam santaḥ prakṛtakarmasu

18. pravicārya svena svasaṃsthena svasthena cetasā
santaḥ vigatodvegam prakṛtakarmasu tiṣṭhanti

18. Having deeply pondered with their own mind (cetasā), which is established in its true nature and at peace, the virtuous (santaḥ) remain free from anxiety (udvega) while performing their natural duties (karma).

Words meanings summery:

• प्रविचार्य (pravicārya) - having deeply pondered/reflected/considered

• स्वसंस्थेन (svasaṁsthena) - by the mind established in its true nature (by one established in oneself/itself)

• स्वस्थेन (svasthena) - by the mind that is at peace (by a healthy/well-abiding/peaceful one)

• स्वेन (svena) - by one's own, with one's own

• चेतसा (cetasā) - with their intellect (by the mind, with the mind, with consciousness)

• तिष्ठन्ति (tiṣṭhanti) - they stand, they remain, they dwell

• विगतोद्वेगम् (vigatodvegam) - free from agitation, without anxiety, calmly

• सन्तः (santaḥ) - the virtuous ones (the good people, the virtuous, the sages, the existing ones)

• प्रकृतकर्मसु (prakṛtakarmasu) - in their natural actions, in their appointed duties

Words meanings and morphology

प्रविचार्य (pravicārya) - having deeply pondered/reflected/considered

(indeclinable)

Gerund (Absolutive)

From root car (to move) with prefixes pra and vi, with suffix lyap.

Prefixes: pra+vi

Root: car (class 1)

स्वसंस्थेन (svasaṁsthena) - by the mind established in its true nature (by one established in oneself/itself)

(adjective)

Instrumental, neuter, singular of svasaṃstha

svasaṁstha - self-established, abiding in one's own nature

Compound type : tatpuruṣa (sva+saṃstha)

• sva – own, one's own, self
  pronoun/adjective
• saṃstha – situated, abiding, established, fixed
  adjective
  Past Passive Participle
  From root sthā with sam.
  Prefix: sam
  Root: sthā (class 1)

Note: Qualifies cetasā.

स्वस्थेन (svasthena) - by the mind that is at peace (by a healthy/well-abiding/peaceful one)

(adjective)

Instrumental, neuter, singular of svastha

svastha - healthy, well, at ease, self-reliant, self-abiding

From sva (own) + stha (standing, being).

Compound type : bahuvrīhi (sva+stha)

• sva – own, self
  pronoun/adjective
• stha – standing, being, existing
  adjective
  From root sthā.
  Root: sthā (class 1)

Note: Qualifies cetasā.

स्वेन (svena) - by one's own, with one's own

(pronoun)

Instrumental, neuter, singular of sva

sva - own, one's own, self

Reflexive possessive pronoun.

Note: Qualifies cetasā.

चेतसा (cetasā) - with their intellect (by the mind, with the mind, with consciousness)

(noun)

Instrumental, neuter, singular of cetas

cetas - mind, consciousness, intellect, understanding

From root cit (to perceive, to understand).

Root: cit (class 1)

तिष्ठन्ति (tiṣṭhanti) - they stand, they remain, they dwell

(verb)

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

Present Tense

From root sthā (to stand). 1st class (bhvādi) verb, reduplicated stem tiṣṭha.

Root: sthā (class 1)

Note: Subject is santaḥ.

विगतोद्वेगम् (vigatodvegam) - free from agitation, without anxiety, calmly

(indeclinable)

Compound type : bahuvrīhi (vigata+udvega)

• vigata – departed, gone, removed, free from
  adjective
  Past Passive Participle
  From root gam (to go) with vi.
  Prefix: vi
  Root: gam (class 1)
• udvega – agitation, anxiety, distress, excitement (udvega)
  noun (masculine)
  From root vij (to tremble) with ud.
  Prefix: ud
  Root: vij (class 6)

Note: Modifies the verb tiṣṭhanti, describing the manner of staying.

सन्तः (santaḥ) - the virtuous ones (the good people, the virtuous, the sages, the existing ones)

(noun)

Nominative, masculine, plural of sant

sant - being, existing, good, virtuous, wise

Present Active Participle

From root as (to be) with suffix śatṛ.

Root: as (class 2)

Note: Subject of tiṣṭhanti.

प्रकृतकर्मसु (prakṛtakarmasu) - in their natural actions, in their appointed duties

(noun)

Locative, neuter, plural of prakṛtakarma

prakṛtakarma - natural actions, ordained duties, proper activities

Compound type : tatpuruṣa (prakṛta+karma)

• prakṛta – natural, original, proper, appointed
  adjective
  Past Passive Participle
  From root kṛ (to do) with pra.
  Prefix: pra
  Root: kṛ (class 8)
• karma – action, deed, duty, work (karma)
  noun (neuter)
  From root kṛ (to do).
  Root: kṛ (class 8)

Note: Location of their remaining/performance.