योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-30, verse-2

अहंतैवालमज्ञानादज्ञत्वस्य निदर्शनम् ।
न हि तज्ज्ञस्य शान्तस्य ममाहमिति विद्यते ॥ २ ॥

ahaṃtaivālamajñānādajñatvasya nidarśanam ,
na hi tajjñasya śāntasya mamāhamiti vidyate 2

2. ahaṃtā eva alam ajñānāt ajñatvasya nidarśanam | na
hi tat-jñasya śāntasya mama aham iti vidyate ||

2. ahaṃtā eva ajñānāt ajñatvasya nidarśanam alam
hi tat-jñasya śāntasya mama aham iti na vidyate

2. The ego-sense (ahaṃtā) itself is indeed the ultimate proof of ignorance (ajñatva), stemming from [spiritual] ignorance (ajñāna). For, in the case of one who knows That [Reality] (tat-jña) and is tranquil (śānta), the notions of 'mine' and 'I' (aham) do not exist.

Words meanings summery:

• अहंता (ahaṁtā) - ego-sense (ahaṃtā) (ego-sense, 'I'-ness, egotism)

• एव (eva) - indeed, only, certainly, just

• अलम् (alam) - enough, sufficient, certainly, indeed, capable

• अज्ञानात् (ajñānāt) - from [spiritual] ignorance (ajñāna) (from ignorance, due to nescience)

• अज्ञत्वस्य (ajñatvasya) - of ignorance (ajñatva) (of ignorance, of the state of being ignorant)

• निदर्शनम् (nidarśanam) - example, illustration, proof, evidence

• न (na) - not, no, nor

• हि (hi) - indeed, for, surely

• तत्-ज्ञस्य (tat-jñasya) - of one who knows That [Reality] (tat-jña) (of the knower of That, of one who knows ultimate reality)

• शान्तस्य (śāntasya) - of the tranquil (śānta) one (of the peaceful, of the tranquil)

• मम (mama) - my, mine

• अहम् (aham) - 'I' (aham) (I, myself, ego)

• इति (iti) - thus, so, denoting quotation or reason

• विद्यते (vidyate) - exists, is found, is

Words meanings and morphology

अहंता (ahaṁtā) - ego-sense (ahaṃtā) (ego-sense, 'I'-ness, egotism)

(noun)

Nominative, feminine, singular of ahaṃtā

ahaṁtā - ego-sense, 'I'-ness, egotism, individuality

एव (eva) - indeed, only, certainly, just

(indeclinable)

अलम् (alam) - enough, sufficient, certainly, indeed, capable

(indeclinable)

अज्ञानात् (ajñānāt) - from [spiritual] ignorance (ajñāna) (from ignorance, due to nescience)

(noun)

Ablative, neuter, singular of ajñāna

ajñāna - ignorance, nescience, spiritual ignorance

Compound type : nañ-tatpuruṣa (a+jñāna)

• a – not, non-
  indeclinable
• jñāna – knowledge, wisdom
  noun (neuter)

अज्ञत्वस्य (ajñatvasya) - of ignorance (ajñatva) (of ignorance, of the state of being ignorant)

(noun)

Genitive, neuter, singular of ajñatva

ajñatva - ignorance, the state of being ignorant

Compound type : nañ-tatpuruṣa (a+jñatva)

• a – not, non-
  indeclinable
• jñatva – the state of knowing, knowledge
  noun (neuter)
  Root: jñā (class 9)

निदर्शनम् (nidarśanam) - example, illustration, proof, evidence

(noun)

Nominative, neuter, singular of nidarśana

nidarśana - example, illustration, proof, evidence, showing

Prefix: ni

Root: dṛś (class 1)

न (na) - not, no, nor

(indeclinable)

हि (hi) - indeed, for, surely

(indeclinable)

तत्-ज्ञस्य (tat-jñasya) - of one who knows That [Reality] (tat-jña) (of the knower of That, of one who knows ultimate reality)

(noun)

Genitive, masculine, singular of tat-jña

tat-jña - knower of That, one who knows the ultimate reality

Compound type : tatpuruṣa (tad+jña)

• tad – That, ultimate reality, Brahman
  pronoun/noun (neuter)
• jña – knowing, one who knows
  adjective/noun (masculine)
  agent noun
  Root: jñā (class 9)

शान्तस्य (śāntasya) - of the tranquil (śānta) one (of the peaceful, of the tranquil)

(adjective)

Genitive, masculine, singular of śānta

śānta - peaceful, tranquil, calm, quieted

Past Passive Participle

Root: śam (class 1)

मम (mama) - my, mine

(pronoun)

Genitive, singular of asmad

asmad - I, me

अहम् (aham) - 'I' (aham) (I, myself, ego)

(pronoun)

Nominative, singular of asmad

asmad - I, me

इति (iti) - thus, so, denoting quotation or reason

(indeclinable)

विद्यते (vidyate) - exists, is found, is

(verb)

3rd person , singular, middle, present indicative (laṭ) of vid

Root: vid (class 4)