योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-66, verse-12

चिद्धनेनैकतामेत्य यदा तिष्ठति निश्चलः ।
शाम्यन्व्यवहरन्वापि तदा संशान्त उच्यते ॥ १२ ॥

ciddhanenaikatāmetya yadā tiṣṭhati niścalaḥ ,
śāmyanvyavaharanvāpi tadā saṃśānta ucyate 12

12. yadā citghanena ekatām etya tiṣṭhati niścalaḥ |
śāmyan vyavaharan vā api tadā saṃśāntaḥ ucyate ||

12. yadā (saḥ) citghanena ekatām etya niścalaḥ tiṣṭhati,
tadā śāmyan vā api vyavaharan (saḥ) saṃśāntaḥ ucyate.

12. When one, having achieved identity with the dense mass of consciousness (citghana), remains unwavering, then, whether remaining inwardly calm (śāmyan) or engaging in worldly activities (vyavaharan), such a person is declared to be perfectly tranquil (saṃśānta).

Words meanings summery:

• यदा (yadā) - when, at which time

• चित्घनेन (citghanena) - with the dense/solid consciousness

• एकताम् (ekatām) - oneness, unity, identity

• एत्य (etya) - having come, having attained, having reached

• तिष्ठति (tiṣṭhati) - he stands, remains, abides

• निश्चलः (niścalaḥ) - unmoving, steady, firm

• शाम्यन् (śāmyan) - becoming calm, ceasing, appeasing

• व्यवहरन् (vyavaharan) - acting, dealing, engaging in affairs

• वा (vā) - or

• अपि (api) - even, also

• संशान्तः (saṁśāntaḥ) - perfectly tranquil, completely calm

• उच्यते (ucyate) - is said, is called

Words meanings and morphology

यदा (yadā) - when, at which time

(indeclinable)

चित्घनेन (citghanena) - with the dense/solid consciousness

(noun)

Instrumental, neuter, singular of citghana

citghana - dense consciousness, solid consciousness, pure consciousness

Compound type : karmadhāraya (cit+ghana)

• cit – consciousness, pure intelligence
  noun (feminine)
  Root: cit (class 10)
• ghana – dense, solid, compact, mass
  adjective (neuter)
  Root: han (class 2)

एकताम् (ekatām) - oneness, unity, identity

(noun)

Accusative, feminine, singular of ekatā

ekatā - oneness, unity, identity

from eka (one) + tā (suffix for abstract noun)

एत्य (etya) - having come, having attained, having reached

(indeclinable)

absolutive

Gerund/absolutive from root i

Root: i (class 2)

तिष्ठति (tiṣṭhati) - he stands, remains, abides

(verb)

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

Present 3rd singular of root sthā

Root: sthā (class 1)

निश्चलः (niścalaḥ) - unmoving, steady, firm

(adjective)

Nominative, masculine, singular of niścala

niścala - unmoving, steady, firm

from nis-cal (not moving)

Compound type : avyayībhāva (nis+cala)

• nis – negation, without
  indeclinable
• cala – moving, trembling
  adjective (masculine)
  from root cal (to move)
  Root: cal (class 1)

शाम्यन् (śāmyan) - becoming calm, ceasing, appeasing

(adjective)

Nominative, masculine, singular of śāmyat

śāmyat - becoming calm, ceasing, appeasing

present active participle

from root śam (to be calm) in the 4th class (śāmya-)

Root: śam (class 4)

व्यवहरन् (vyavaharan) - acting, dealing, engaging in affairs

(adjective)

Nominative, masculine, singular of vyavaharat

vyavaharat - acting, dealing, behaving

present active participle

from vi-ava-hṛ (to act, transact)

Prefixes: vi+ava

Root: hṛ (class 1)

वा (vā) - or

(indeclinable)

अपि (api) - even, also

(indeclinable)

संशान्तः (saṁśāntaḥ) - perfectly tranquil, completely calm

(adjective)

Nominative, masculine, singular of saṃśānta

saṁśānta - perfectly tranquil, completely calm

past passive participle

from sam-śam (to be calm, cease)

Prefix: sam

Root: śam (class 4)

उच्यते (ucyate) - is said, is called

(verb)

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

Present 3rd singular passive from root vac

Root: vac (class 2)