योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-10, verse-18

मुक्तं तमःप्रकाशाभ्यामित्येतदजरं पदम् ।
आकाशकोशमेवेदं विद्धि कोशं जगत्स्थितेः ॥ १८ ॥

muktaṃ tamaḥprakāśābhyāmityetadajaraṃ padam ,
ākāśakośamevedaṃ viddhi kośaṃ jagatsthiteḥ 18

18. muktam tamaḥprakāśābhyām iti etat ajaram padam
ākāśakośam eva idam viddhi kośam jagatsthiteḥ

18. tamaḥprakāśābhyām muktam iti etat ajaram padam (bhavati).
idam ākāśakośam eva jagatsthiteḥ kośam viddhi.

18. This imperishable (ajara) state (pada) is described as "freed from both darkness and light." Know this (idam), which is the sheath (kośa) of space (ākāśa), to be indeed the very sheath for the world's existence.

Words meanings summery:

• मुक्तम् (muktam) - freed, liberated, released

• तमःप्रकाशाभ्याम् (tamaḥprakāśābhyām) - from darkness and light, from shadow and illumination

• इति (iti) - introduces a quote or statement (thus, so, in this manner)

• एतत् (etat) - this, this one

• अजरम् (ajaram) - ageless, imperishable, undecaying

• पदम् (padam) - state, position (spiritual) (state, condition, abode, word, step)

• आकाशकोशम् (ākāśakośam) - the sheath of space, the spatial covering

• एव (eva) - only, just, indeed

• इदम् (idam) - this, this one

• विद्धि (viddhi) - know, understand

• कोशम् (kośam) - sheath, treasury, cell

• जगत्स्थितेः (jagatsthiteḥ) - of the world's existence, of the world's stability

Words meanings and morphology

मुक्तम् (muktam) - freed, liberated, released

(adjective)

Nominative, neuter, singular of mukta

mukta - freed, liberated, released, delivered

Past Passive Participle

From root muc- (to release)

Root: muc (class 6)

Note: Qualifies 'padam'.

तमःप्रकाशाभ्याम् (tamaḥprakāśābhyām) - from darkness and light, from shadow and illumination

(noun)

Ablative, dual of tamaḥprakāśa

tamaḥprakāśa - darkness and light

Compound type : dvandva (tamas+prakāśa)

• tamas – darkness, ignorance
  noun (neuter)
• prakāśa – light, illumination, manifestation
  noun (masculine)
  From pra-kāś- (to shine forth)
  Prefix: pra
  Root: kāś (class 1)

Note: Used in ablative sense, "freed from".

इति (iti) - introduces a quote or statement (thus, so, in this manner)

(indeclinable)

Particle used to mark a quotation or thought.

एतत् (etat) - this, this one

(pronoun)

Nominative, neuter, singular of etad

etad - this, this one

Demonstrative pronoun.

Note: Refers to 'padam'.

अजरम् (ajaram) - ageless, imperishable, undecaying

(adjective)

Nominative, neuter, singular of ajara

ajara - ageless, undecaying, imperishable

Negative prefix 'a-' + 'jara' (decay, old age)

Compound type : nañ-tatpurusha (a+jara)

• a – not, un-
  indeclinable
  Negative prefix
• jara – old age, decay
  noun (feminine)
  From root jṛ- (to decay)
  Root: jṛ (class 1)

Note: Qualifies 'padam'.

पदम् (padam) - state, position (spiritual) (state, condition, abode, word, step)

(noun)

Nominative, neuter, singular of pada

pada - step, foot, abode, state, condition, position, word, verse quarter

Note: Subject of the first sentence.

आकाशकोशम् (ākāśakośam) - the sheath of space, the spatial covering

(noun)

Accusative, neuter, singular of ākāśakośa

ākāśakośa - sheath of space, spatial covering

Compound type : tatpurusha (ākāśa+kośa)

• ākāśa – space, ether, sky
  noun (masculine)
• kośa – sheath, treasury, cell
  noun (masculine)

Note: Object of 'viddhi'.

एव (eva) - only, just, indeed

(indeclinable)

Emphatic particle

इदम् (idam) - this, this one

(pronoun)

Accusative, neuter, singular of idam

idam - this, this one, he/she/it

Demonstrative pronoun.

Note: Object of 'viddhi'.

विद्धि (viddhi) - know, understand

(verb)

2nd person , singular, active, imperative (lot) of vid

Imperative active

2nd singular imperative active of root vid- (to know)

Root: vid (class 2)

कोशम् (kośam) - sheath, treasury, cell

(noun)

Accusative, neuter, singular of kośa

kośa - sheath, treasury, cell, covering

Note: Predicate accusative with 'viddhi'.

जगत्स्थितेः (jagatsthiteḥ) - of the world's existence, of the world's stability

(noun)

Genitive, feminine, singular of jagatsthiti

jagatsthiti - existence of the world, stability of the world

Compound type : tatpurusha (jagat+sthiti)

• jagat – world, universe, moving
  noun (neuter)
  Present active participle
  From root gam- (to go) in present active participle form
  Root: gam (class 1)
• sthiti – standing, state, existence, stability
  noun (feminine)
  From root sthā- (to stand)
  Root: sthā (class 1)

Note: Qualifies 'kośam'.