योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-68, verse-10

त्रिषु मौनविशेषेषु विषयः काष्ठतापसः ।
सुषुप्तमौनावस्थायां सा तुर्या सैव मुक्तधीः ॥ १० ॥

triṣu maunaviśeṣeṣu viṣayaḥ kāṣṭhatāpasaḥ ,
suṣuptamaunāvasthāyāṃ sā turyā saiva muktadhīḥ 10

10. triṣu maunaviśeṣeṣu viṣayaḥ kāṣṭhatāpasaḥ
suṣuptamaunāvasthāyām sā turyā sā eva muktadhīḥ

10. triṣu maunaviśeṣeṣu kāṣṭhatāpasaḥ viṣayaḥ
suṣuptamaunāvasthāyām sā turyā sā eva muktadhīḥ

10. Among the three particular kinds of silence [speech, sense, and inert mental], the one confined is the 'log-like ascetic' (kāṣṭhatāpasa). That state of 'deep-sleep silence' (suṣuptamaunāvasthā) is the transcendental (turyā) state itself, which is verily the liberated intellect (muktadhī).

Words meanings summery:

• त्रिषु (triṣu) - in the three

• मौनविशेषेषु (maunaviśeṣeṣu) - among the three specific types of inert silence (speech, sense, and inert mental silence) (among the special kinds of silence)

• विषयः (viṣayaḥ) - the domain or practitioner of these silences (scope, domain, subject)

• काष्ठतापसः (kāṣṭhatāpasaḥ) - an ascetic whose practice of austerity (tapas) is merely inert, like a log (the log-like ascetic)

• सुषुप्तमौनावस्थायाम् (suṣuptamaunāvasthāyām) - in the state of deep-sleep silence

• सा (sā) - that (feminine)

• तुर्या (turyā) - the fourth (state), transcendental state

• सा एव (sā eva) - that very one, indeed that

• मुक्तधीः (muktadhīḥ) - the liberated intellect

Words meanings and morphology

त्रिषु (triṣu) - in the three

(adjective)

Locative, plural of tri

tri - three

मौनविशेषेषु (maunaviśeṣeṣu) - among the three specific types of inert silence (speech, sense, and inert mental silence) (among the special kinds of silence)

(noun)

Locative, masculine, plural of maunaviśeṣa

maunaviśeṣa - special kind of silence

Compound type : tatpuruṣa (mauna+viśeṣa)

• mauna – silence, quietness
  noun (neuter)
  derived from muni (sage)
• viśeṣa – distinction, particularity, special kind
  noun (masculine)
  Prefix: vi

विषयः (viṣayaḥ) - the domain or practitioner of these silences (scope, domain, subject)

(noun)

Nominative, masculine, singular of viṣaya

viṣaya - object, sphere, domain, subject, range

काष्ठतापसः (kāṣṭhatāpasaḥ) - an ascetic whose practice of austerity (tapas) is merely inert, like a log (the log-like ascetic)

(noun)

Nominative, masculine, singular of kāṣṭhatāpasa

kāṣṭhatāpasa - log-like ascetic, one whose austerity is inert

Compound type : karmadhāraya (kāṣṭha+tāpasa)

• kāṣṭha – wood, log
  noun (neuter)
• tāpasa – ascetic, hermit
  noun (masculine)
  from tapas (austerity)

सुषुप्तमौनावस्थायाम् (suṣuptamaunāvasthāyām) - in the state of deep-sleep silence

(noun)

Locative, feminine, singular of suṣuptamaunāvasthā

suṣuptamaunāvasthā - state of deep-sleep silence

Compound type : tatpuruṣa (suṣuptamauna+avasthā)

• suṣuptamauna – deep-sleep silence
  noun (neuter)
• avasthā – state, condition
  noun (feminine)
  Prefix: ava
  Root: sthā (class 1)

सा (sā) - that (feminine)

(pronoun)

Nominative, feminine, singular of tad

tad - that, she

तुर्या (turyā) - the fourth (state), transcendental state

(noun)

Nominative, feminine, singular of turyā

turyā - the fourth state (referring to the transcendental state in Advaita Vedanta)

सा एव (sā eva) - that very one, indeed that

(indeclinable)

Note: eva is an emphatic particle, here used with the pronoun 'sā'

मुक्तधीः (muktadhīḥ) - the liberated intellect

(adjective)

Nominative, feminine, singular of muktadhī

muktadhī - liberated intellect, one whose intellect is free

Compound type : bahuvrīhi (mukta+dhī)

• mukta – liberated, free
  past passive participle (feminine)
  Past Passive Participle
  from muc (to release, liberate)
  Root: muc (class 6)
• dhī – intellect, thought, understanding
  noun (feminine)