योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-60, verse-36

गगने मानसं स्पन्दं जगद्विद्धि न वस्तु तत् ।
मिथ्याज्ञानपिशाचस्य स्पन्ददर्शनमाकृति ॥ ३६ ॥

gagane mānasaṃ spandaṃ jagadviddhi na vastu tat ,
mithyājñānapiśācasya spandadarśanamākṛti 36

36. gagane mānasam spandam jagat viddhi na vastu
tat mithyājñānapiśācasya spandadarśanam ākṛti

36. jagat gagane mānasam spandam viddhi tat vastu
na mithyājñānapiśācasya spandadarśanam ākṛti

36. Understand that the world (jagat) is merely a mental pulsation (spanda) within space, and it is not a tangible reality (vastu). The perception of this pulsation is the very manifestation (ākṛti) of the goblin of erroneous knowledge.

Words meanings summery:

• गगने (gagane) - in space, in the sky, in the ether

• मानसम् (mānasam) - mental, relating to the mind

• स्पन्दम् (spandam) - vibration, pulsation, movement

• जगत् (jagat) - the world, universe, what moves

• विद्धि (viddhi) - know, understand, realize (imperative)

• न (na) - not, no

• वस्तु (vastu) - substance, reality, thing, object

• तत् (tat) - that, it

• मिथ्याज्ञानपिशाचस्य (mithyājñānapiśācasya) - of the goblin of false knowledge, of the demon of illusion

• स्पन्ददर्शनम् (spandadarśanam) - the perception of pulsation/vibration

• आकृति (ākṛti) - form, shape, manifestation, appearance

Words meanings and morphology

गगने (gagane) - in space, in the sky, in the ether

(noun)

Locative, neuter, singular of gagana

gagana - sky, atmosphere, space, ether

मानसम् (mānasam) - mental, relating to the mind

(adjective)

Accusative, neuter, singular of mānasa

mānasa - mental, spiritual, relating to the mind

Derived from manas (mind).

स्पन्दम् (spandam) - vibration, pulsation, movement

(noun)

Accusative, masculine, singular of spanda

spanda - vibration, pulsation, tremor, movement

Derived from the root spand, 'to tremble, vibrate'.

Root: spand (class 1)

जगत् (jagat) - the world, universe, what moves

(noun)

Nominative, neuter, singular of jagat

jagat - the world, universe, living beings, moving

Present Active Participle (from gam)

Derived from the root gam (to go, move).

Root: gam (class 1)

विद्धि (viddhi) - know, understand, realize (imperative)

(verb)

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

Root: vid (class 2)

न (na) - not, no

(indeclinable)

वस्तु (vastu) - substance, reality, thing, object

(noun)

Nominative, neuter, singular of vastu

vastu - substance, reality, thing, object, wealth

तत् (tat) - that, it

(pronoun)

Nominative, neuter, singular of tat

tat - that, it

मिथ्याज्ञानपिशाचस्य (mithyājñānapiśācasya) - of the goblin of false knowledge, of the demon of illusion

(noun)

Genitive, masculine, singular of mithyājñānapiśāca

mithyājñānapiśāca - goblin/demon of false knowledge/illusion

Compound type : ṣaṣṭhī-tatpuruṣa (mithyājñāna+piśāca)

• mithyājñāna – false knowledge, illusion, erroneous cognition
  noun (neuter)
• piśāca – goblin, demon, evil spirit
  noun (masculine)

स्पन्ददर्शनम् (spandadarśanam) - the perception of pulsation/vibration

(noun)

Nominative, neuter, singular of spandadarśana

spandadarśana - sight/perception of vibration

Compound type : ṣaṣṭhī-tatpuruṣa (spanda+darśana)

• spanda – vibration, pulsation
  noun (masculine)
  Root: spand (class 1)
• darśana – seeing, perception, vision, sight
  noun (neuter)
  Root: dṛś (class 1)

आकृति (ākṛti) - form, shape, manifestation, appearance

(noun)

Nominative, feminine, singular of ākṛti

ākṛti - form, shape, appearance, manifestation, figure

Prefix: ā

Root: kṛ (class 8)