योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-43, verse-23

तदा ममाभूदज्ञानं प्रशान्तमधुना तु तत् ।
कलङ्क आत्मनोऽस्तीति तदज्ञानवशेन या ॥ २३ ॥

tadā mamābhūdajñānaṃ praśāntamadhunā tu tat ,
kalaṅka ātmano'stīti tadajñānavaśena yā 23

23. tadā mama abhūt ajñānam praśāntam adhunā tu tat
kalaṅkaḥ ātmanaḥ asti iti tat ajñānavasena yā

23. tadā mama ajñānam praśāntam abhūt adhunā tu
tat ajñānavasena ātmanaḥ kalaṅkaḥ asti iti yā

23. My ignorance (ajñāna) was pacified back then. But now, the notion that there is an impurity in the Self (ātman) — arising due to that very ignorance (ajñāna) — which (illusion)...

Words meanings summery:

• तदा (tadā) - then, at that time

• मम (mama) - my, of me

• अभूत् (abhūt) - was, came into being, became

• अज्ञानम् (ajñānam) - ignorance (ajñāna) in a spiritual or metaphysical sense (ignorance, nescience)

• प्रशान्तम् (praśāntam) - pacified, tranquil, quieted, calmed

• अधुना (adhunā) - now, at present

• तु (tu) - but, indeed, however

• तत् (tat) - that (refers to the upcoming notion/illusion) (that)

• कलङ्कः (kalaṅkaḥ) - blemish, stain, impurity, fault

• आत्मनः (ātmanaḥ) - of the Self (ātman) (of the Self, of the soul)

• अस्ति (asti) - is, exists

• इति (iti) - thus, so, in this manner, marking quotation/explanation

• तत् (tat) - that (ignorance) (that)

• अज्ञानवसेन (ajñānavasena) - due to ignorance (ajñāna) (by means of ignorance, due to ignorance, under the sway of ignorance)

• या (yā) - which (illusion, referring to `bhrānti` in the next verse) (which)

Words meanings and morphology

तदा (tadā) - then, at that time

(indeclinable)

Temporal adverb from `tad` (that).

मम (mama) - my, of me

(pronoun)

Genitive, singular of mad

mad - I, me

1st person pronoun.

अभूत् (abhūt) - was, came into being, became

(verb)

3rd person , singular, active, aorist (luṅ) of bhū

Aorist

3rd person singular Aorist active of root `bhū`.

Root: bhū (class 1)

अज्ञानम् (ajñānam) - ignorance (ajñāna) in a spiritual or metaphysical sense (ignorance, nescience)

(noun)

Nominative, neuter, singular of ajñāna

ajñāna - ignorance, nescience, want of knowledge

Formed from `a` (negation) + `jñāna` (knowledge).

Compound type : Nañ-tatpuruṣa (a+jñāna)

• a – not, un-, without
  indeclinable
  Negation particle
• jñāna – knowledge, wisdom, understanding
  noun (neuter)
  From root `jñā` (to know) + `ana` suffix.
  Root: jñā (class 9)

प्रशान्तम् (praśāntam) - pacified, tranquil, quieted, calmed

(adjective)

Nominative, neuter, singular of praśānta

praśānta - perfectly calm, tranquil, quieted, pacified, extinguished

Past Passive Participle

From `pra` (prefix) + root `śam` (to be calm) + `kta` suffix.

Prefix: pra

Root: śam (class 4)

अधुना (adhunā) - now, at present

(indeclinable)

Temporal adverb.

तु (tu) - but, indeed, however

(indeclinable)

Particle expressing contrast or emphasis.

तत् (tat) - that (refers to the upcoming notion/illusion) (that)

(pronoun)

Nominative, neuter, singular of tad

tad - that, it, he, she

Demonstrative pronoun.

कलङ्कः (kalaṅkaḥ) - blemish, stain, impurity, fault

(noun)

Nominative, masculine, singular of kalaṅka

kalaṅka - stain, spot, blemish, fault, impurity, disgrace

आत्मनः (ātmanaḥ) - of the Self (ātman) (of the Self, of the soul)

(noun)

Genitive, masculine, singular of ātman

ātman - self, soul, spirit, individual essence, life

अस्ति (asti) - is, exists

(verb)

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

Present active

3rd person singular present active indicative of root `as`.

Root: as (class 2)

इति (iti) - thus, so, in this manner, marking quotation/explanation

(indeclinable)

Particle.

तत् (tat) - that (ignorance) (that)

(pronoun)

neuter, singular of tad

tad - that, it, he, she

Demonstrative pronoun.

Note: Here `tat` modifies `ajñānavasena`, so it refers to 'that' ignorance.

अज्ञानवसेन (ajñānavasena) - due to ignorance (ajñāna) (by means of ignorance, due to ignorance, under the sway of ignorance)

(noun)

Instrumental, masculine, singular of ajñānavasa

ajñānavasa - sway of ignorance, power of ignorance

Compound of `ajñāna` and `vasa`.

Compound type : Tatpuruṣa (ajñāna+vasa)

• ajñāna – ignorance, nescience, want of knowledge
  noun (neuter)
  Formed from `a` (negation) + `jñāna` (knowledge).
• vasa – sway, power, control, will, command
  noun (masculine)

या (yā) - which (illusion, referring to `bhrānti` in the next verse) (which)

(pronoun)

Nominative, feminine, singular of yad

yad - who, which, what

Relative pronoun.

Note: Begins a relative clause, referring to `bhrānti` in the following verse.