योगवासिष्ठः yogavāsiṣṭhaḥ - book-2, chapter-14, verse-39

वेदवेदान्तस्रिद्धान्तस्थितयः स्थितिकारणम् ।
निर्णीयन्ते विचारेण दीपेन च भुवो निशि ॥ ३९ ॥

vedavedāntasriddhāntasthitayaḥ sthitikāraṇam ,
nirṇīyante vicāreṇa dīpena ca bhuvo niśi 39

39. veda-vedānta-siddhānta-sthitayaḥ sthiti-kāraṇam
nirṇīyante vicāreṇa dīpena ca bhuvo niśi

39. veda-vedānta-siddhānta-sthitayaḥ sthiti-kāraṇam
vicāreṇa nirṇīyante ca dīpena bhuvo niśi

39. The established principles of the Vedas and Vedānta, which are the very foundation of existence, are clearly ascertained through proper inquiry (vicāra), just as objects on the earth are revealed by a lamp at night.

Words meanings summery:

• वेद-वेदान्त-सिद्धान्त-स्थितयः (veda-vedānta-siddhānta-sthitayaḥ) - The established principles/doctrines of the Vedas and Vedānta

• स्थिति-कारणम् (sthiti-kāraṇam) - the cause of existence, the reason for stability

• निर्णीयन्ते (nirṇīyante) - are ascertained, are determined, are decided

• विचारेण (vicāreṇa) - by inquiry, by deliberation, by investigation

• दीपेन (dīpena) - by a lamp, by light

• च (ca) - and, also, as

• भुवो (bhuvo) - of the earth

• निशि (niśi) - at night

Words meanings and morphology

वेद-वेदान्त-सिद्धान्त-स्थितयः (veda-vedānta-siddhānta-sthitayaḥ) - The established principles/doctrines of the Vedas and Vedānta

(noun)

Nominative, feminine, plural of veda-vedānta-siddhānta-sthiti

veda-vedānta-siddhānta-sthiti - The established principles/doctrines of the Vedas and Vedānta

Compound noun

Compound type : tatpuruṣa (veda+vedānta+siddhānta+sthiti)

• veda – knowledge, sacred text, the collection of hymns
  noun (masculine)
  From root vid (to know)
  Root: vid (class 2)
• vedānta – the end/conclusion of the Vedas, a school of Hindu philosophy
  noun (masculine)
  Compound of Veda + anta
• siddhānta – established conclusion, doctrine, tenet, theory
  noun (masculine)
  From sidh (to accomplish) with sam
  Prefix: sam
  Root: sidh (class 1)
• sthiti – standing, staying, being, existence, stability, established state, doctrine
  noun (feminine)
  From root sthā (to stand)
  Root: sthā (class 1)

स्थिति-कारणम् (sthiti-kāraṇam) - the cause of existence, the reason for stability

(noun)

Nominative, neuter, singular of sthiti-kāraṇa

sthiti-kāraṇa - cause of existence, cause of stability

Compound noun

Compound type : tatpuruṣa (sthiti+kāraṇa)

• sthiti – standing, staying, being, existence, stability
  noun (feminine)
  From root sthā
  Root: sthā (class 1)
• kāraṇa – cause, reason, instrument
  noun (neuter)
  From root kṛ (to do, make)
  Root: kṛ (class 8)

निर्णीयन्ते (nirṇīyante) - are ascertained, are determined, are decided

(verb)

3rd person , plural, passive, present (laṭ) of nirṇī

Passive voice, present tense, 3rd person plural

Prefix: nir

Root: nī (class 1)

विचारेण (vicāreṇa) - by inquiry, by deliberation, by investigation

(noun)

Instrumental, masculine, singular of vicāra

vicāra - inquiry, investigation, deliberation, consideration

From root car (to move, wander) with prefix vi

Prefix: vi

Root: car (class 1)

दीपेन (dīpena) - by a lamp, by light

(noun)

Instrumental, masculine, singular of dīpa

dīpa - lamp, light

From root dīp (to shine)

Root: dīp (class 4)

च (ca) - and, also, as

(indeclinable)

Conjunction

भुवो (bhuvo) - of the earth

(noun)

Genitive, feminine, singular of bhū

bhū - earth, ground, place, being

From root bhū (to be, exist)

Root: bhū (class 1)

निशि (niśi) - at night

(noun)

Locative, feminine, singular of niś

niś - night