योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-82, verse-51

न त्वमस्ति न देहोस्तिब्रह्मास्तीह महत्स्फुरत् ।
अहंत्वमिति निःस्पन्दे स्फुरत्यार्तिहि कस्य का ॥ ५१ ॥

na tvamasti na dehostibrahmāstīha mahatsphurat ,
ahaṃtvamiti niḥspande sphuratyārtihi kasya kā 51

51. na tvam asti na dehaḥ asti brahma asti iha mahat sphurat
ahaṃtvam iti niḥspande sphurati ārtiḥ hi kasya kā

51. tvam na asti dehaḥ na asti iha mahat sphurat brahma
asti niḥspande ahaṃtvam iti ārtiḥ hi kasya kā sphurati

51. Neither are you (the individual self) real, nor does the body truly exist. Here, only the great, pulsating reality of Brahman (brahman) exists. When there is complete stillness, this 'I-ness' (ahaṃtvam) and its suffering – for whom, and what kind, can they possibly arise?

Words meanings summery:

• न (na) - not, no

• त्वम् (tvam) - the limited, individual "you", not the ultimate Self (you (the individual self/ego))

• अस्ति (asti) - is, exists

• न (na) - not, no

• देहः (dehaḥ) - the physical body, as an object of identification (body)

• अस्ति (asti) - is, exists

• ब्रह्म (brahma) - the ultimate, all-pervading reality (Brahman, the Absolute Reality, the Supreme Being)

• अस्ति (asti) - is, exists

• इह (iha) - here, in this world, in this context

• महत् (mahat) - grand, supreme, referring to Brahman (great, large, mighty, immense)

• स्फुरत् (sphurat) - radiantly manifesting, vibrant (describing Brahman) (shining, pulsating, vibrating, manifesting)

• अहंत्वम् (ahaṁtvam) - the sense of "I" as a separate entity (ego, 'I-ness', individuality)

• इति (iti) - marks the end of a quote or refers to the preceding idea. Here, "this 'I-ness' (ahaṃtvam) and (its suffering)". (thus, in this manner, as such)

• निःस्पन्दे (niḥspande) - when there is no mental movement or egoic activity (in the motionless, in the tranquil, in the absence of vibration)

• स्फुरति (sphurati) - how can it arise/manifest (flashes, manifests, throbs, arises)

• आर्तिः (ārtiḥ) - the suffering caused by egoic identification (pain, suffering, distress, affliction)

• हि (hi) - indeed, certainly, for

• कस्य (kasya) - whose? of whom?

• का (kā) - what kind? which?

Words meanings and morphology

न (na) - not, no

(indeclinable)

Negative particle.

त्वम् (tvam) - the limited, individual "you", not the ultimate Self (you (the individual self/ego))

(pronoun)

Nominative, singular of yuṣmad

yuṣmad - you (pronoun)

Note: Used here to denote the ego or individual self that one identifies with.

अस्ति (asti) - is, exists

(verb)

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

present indicative, 3rd person singular

Root: as (class 2)

न (na) - not, no

(indeclinable)

Negative particle.

देहः (dehaḥ) - the physical body, as an object of identification (body)

(noun)

Nominative, masculine, singular of deha

deha - body, form, person

Root: dih (class 4)

अस्ति (asti) - is, exists

(verb)

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

present indicative, 3rd person singular

Root: as (class 2)

ब्रह्म (brahma) - the ultimate, all-pervading reality (Brahman, the Absolute Reality, the Supreme Being)

(noun)

Nominative, neuter, singular of brahman

brahman - Brahman, the Absolute Reality, the Supreme Being, the ultimate principle

Root: bṛh (class 1)

Note: This is 'brahman' (neuter) as opposed to 'brahmā' (masculine deity).

अस्ति (asti) - is, exists

(verb)

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

present indicative, 3rd person singular

Root: as (class 2)

इह (iha) - here, in this world, in this context

(indeclinable)

Adverb of place.

महत् (mahat) - grand, supreme, referring to Brahman (great, large, mighty, immense)

(adjective)

Nominative, neuter, singular of mahat

mahat - great, large, mighty, immense, powerful

Present active participle of √mah (to be great), used as an adjective.

Root: mah (class 1)

Note: It's a participle functioning as an adjective.

स्फुरत् (sphurat) - radiantly manifesting, vibrant (describing Brahman) (shining, pulsating, vibrating, manifesting)

(adjective)

Nominative, neuter, singular of sphurat

sphurat - shining, throbbing, vibrating, manifesting, expanding

Present Active Participle

derived from √sphur (to throb, flash, manifest)

Root: sphur (class 6)

Note: Participle acting as an adjective.

अहंत्वम् (ahaṁtvam) - the sense of "I" as a separate entity (ego, 'I-ness', individuality)

(noun)

Nominative, neuter, singular of ahaṃtva

ahaṁtva - ego, 'I-ness', individuality, egohood

Formed from 'aham' (I) + 'tva' (abstract suffix meaning '-ness').

Compound type : tatpuruṣa (aham+tva)

• aham – I
  pronoun
• tva – abstract suffix forming nouns ('-ness', '-hood')
  suffix (neuter)

इति (iti) - marks the end of a quote or refers to the preceding idea. Here, "this 'I-ness' (ahaṃtvam) and (its suffering)". (thus, in this manner, as such)

(indeclinable)

Particle.

निःस्पन्दे (niḥspande) - when there is no mental movement or egoic activity (in the motionless, in the tranquil, in the absence of vibration)

(noun)

Locative, masculine, singular of niḥspanda

niḥspanda - motionless, tranquil, free from vibration or movement

Formed from 'nis' (without) + 'spanda' (vibration, movement).

Compound type : bahuvrīhi (nis+spanda)

• nis – without, out, free from
  prefix
• spanda – vibration, throbbing, movement, pulsation
  noun (masculine)
  derived from √spad
  Root: spad (class 1)

Note: Used adverbially for "in a state of motionlessness."

स्फुरति (sphurati) - how can it arise/manifest (flashes, manifests, throbs, arises)

(verb)

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

present indicative, 3rd person singular

Root: sphur (class 6)

आर्तिः (ārtiḥ) - the suffering caused by egoic identification (pain, suffering, distress, affliction)

(noun)

Nominative, feminine, singular of ārti

ārti - pain, suffering, distress, affliction, trouble

derived from √ṛ (to go, move, rise) with prefix ā.

Prefix: ā

Root: ṛ (class 3)

हि (hi) - indeed, certainly, for

(indeclinable)

Particle.

कस्य (kasya) - whose? of whom?

(pronoun)

Genitive, masculine/neuter, singular of kim

kim - what, who, which

Note: Could be masculine or neuter.

का (kā) - what kind? which?

(pronoun)

Nominative, feminine, singular of kim

kim - what, who, which

Feminine nominative singular form of 'kim'.