योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-9, verse-23

मिथः स्वान्ते तयोरन्तश्छायातपनयोरिव ।
अविद्यायां विलीनायां क्षीणे द्वे एव कल्पने ॥ २३ ॥

mithaḥ svānte tayorantaśchāyātapanayoriva ,
avidyāyāṃ vilīnāyāṃ kṣīṇe dve eva kalpane 23

23. mithaḥ svānte tayoḥ antaḥ chāyā ātapanayoḥ
iva avidyāyām vilīnāyām kṣīṇe dve eva kalpane

23. tayoḥ antaḥ mithaḥ svānte chāyā ātapanayoḥ iva.
avidyāyām vilīnāyām dve kalpane eva kṣīṇe.

23. These two (vidyā and avidyā) exist in mutual opposition within their own being, like the interplay of shadow and light (chāyātapa). When ignorance (avidyā) is completely dissolved, these two notions (kalpanā) themselves become diminished.

Words meanings summery:

• मिथः (mithaḥ) - mutually, reciprocally, secretly

• स्वान्ते (svānte) - within oneself, in one's own mind/heart

• तयोः (tayoḥ) - Refers to vidyā and avidyā. (of those two, between those two)

• अन्तः (antaḥ) - between, within, amidst

• छाया (chāyā) - shadow, shade, reflection

• आतपनयोः (ātapanayoḥ) - Used here in conjunction with chāyā (shadow) to mean 'shadow and light' as a dual compound. (of sun-heat and light, of sunshine)

• इव (iva) - like, as, similar to

• अविद्यायाम् (avidyāyām) - Used in locative absolute construction. (in ignorance, when ignorance)

• विलीनायाम् (vilīnāyām) - Used in locative absolute construction, agreeing with avidyāyām. (when dissolved, merged, disappeared)

• क्षीणे (kṣīṇe) - Agrees with dve kalpane. (diminished, exhausted, destroyed)

• द्वे (dve) - Agrees with kalpane. (two)

• एव (eva) - indeed, only, certainly

• कल्पने (kalpane) - Refers to avidyā and vidyā. (notions, imaginings, conceptions)

Words meanings and morphology

मिथः (mithaḥ) - mutually, reciprocally, secretly

(indeclinable)

स्वान्ते (svānte) - within oneself, in one's own mind/heart

(noun)

Locative, neuter, singular of svānta

svānta - one's own mind, heart, inner self

Compound type : tatpuruṣa (sva+anta)

• sva – own, one's own
  adjective
• anta – end, interior, limit
  noun (masculine)

तयोः (tayoḥ) - Refers to vidyā and avidyā. (of those two, between those two)

(pronoun)

Genitive, dual of tad

tad - that, that one

अन्तः (antaḥ) - between, within, amidst

(indeclinable)

Note: Often used as a preposition 'between'.

छाया (chāyā) - shadow, shade, reflection

(noun)

Nominative, feminine, singular of chāyā

chāyā - shadow, shade, reflection, image

आतपनयोः (ātapanayoḥ) - Used here in conjunction with chāyā (shadow) to mean 'shadow and light' as a dual compound. (of sun-heat and light, of sunshine)

(noun)

Genitive, masculine, dual of ātapa

ātapa - sun-heat, sunshine, light

Derived from root tap (to heat) with upasarga ā

Prefix: ā

Root: tap (class 1)

इव (iva) - like, as, similar to

(indeclinable)

अविद्यायाम् (avidyāyām) - Used in locative absolute construction. (in ignorance, when ignorance)

(noun)

Locative, feminine, singular of avidyā

avidyā - ignorance, nescience, spiritual ignorance

Compound of a (not) + vidyā (knowledge)

Compound type : nañ-tatpuruṣa (a+vidyā)

• a – not, non-, un-
  indeclinable
  Negative prefix
• vidyā – knowledge, true knowledge, spiritual knowledge
  noun (feminine)
  Derived from root vid (to know)
  Root: vid (class 2)

विलीनायाम् (vilīnāyām) - Used in locative absolute construction, agreeing with avidyāyām. (when dissolved, merged, disappeared)

(adjective)

Locative, feminine, singular of vilīna

vilīna - dissolved, merged, disappeared, melted away

Past Passive Participle

Derived from root lī (to cling to, melt) with upasarga vi

Prefix: vi

Root: lī (class 4)

क्षीणे (kṣīṇe) - Agrees with dve kalpane. (diminished, exhausted, destroyed)

(adjective)

Nominative, neuter, dual of kṣīṇa

kṣīṇa - diminished, exhausted, destroyed, wasted away

Past Passive Participle

Derived from root kṣi (to destroy, to wane) with suffix -ta

Root: kṣi (class 1)

द्वे (dve) - Agrees with kalpane. (two)

(numeral)

एव (eva) - indeed, only, certainly

(indeclinable)

कल्पने (kalpane) - Refers to avidyā and vidyā. (notions, imaginings, conceptions)

(noun)

Nominative, feminine, dual of kalpanā

kalpanā - imagination, notion, mental construction, idea, hypothesis

Derived from root kḷp (to be able, to arrange)

Root: kḷp (class 1)