योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-81, verse-30

तपत्येकश्चिदादित्यो रात्रिंदिवमतन्द्रितः ।
अन्तर्बहिः शिलाद्यन्तरप्यनस्तमयोदयः ॥ ३० ॥

tapatyekaścidādityo rātriṃdivamatandritaḥ ,
antarbahiḥ śilādyantarapyanastamayodayaḥ 30

30. tapati ekaḥ cidādityaḥ rātriṃdivam atandritaḥ |
antaḥ bahiḥ śilādyantaram api anastamayodayaḥ ||

30. ekaḥ cidādityaḥ atandritaḥ rātriṃdivam antaḥ bahiḥ śilādyantaram api anastamayodayaḥ (san) tapati.

30. The single sun of consciousness (cit-āditya) shines untiringly day and night, without setting or rising, both internally and externally, even within rocks and similar objects.

Words meanings summery:

• तपति (tapati) - shines (shines, burns, heats)

• एकः (ekaḥ) - single, unique (one, single, alone, unique)

• चिदादित्यः (cidādityaḥ) - the sun of consciousness

• रात्रिंदिवम् (rātriṁdivam) - day and night (day and night, continuously)

• अतन्द्रितः (atandritaḥ) - untiringly, unwearied (untiring, unwearied, diligent, alert)

• अन्तः (antaḥ) - internally (inside, within, internal)

• बहिः (bahiḥ) - externally (outside, externally)

• शिलाद्यन्तरम् (śilādyantaram) - even within rocks and similar objects (even within rocks etc.)

• अपि (api) - even (also, even, too)

• अनस्तमयोदयः (anastamayodayaḥ) - without setting or rising

Words meanings and morphology

तपति (tapati) - shines (shines, burns, heats)

(verb)

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

Present Active Indicative

From root √tap, parasmaipada.

Root: tap (class 1)

एकः (ekaḥ) - single, unique (one, single, alone, unique)

(adjective)

Nominative, masculine, singular of eka

eka - one, single, alone, unique, chief

Note: Sandhi: ekaḥ + cidādityaḥ -> ekaś cidādityaḥ.

चिदादित्यः (cidādityaḥ) - the sun of consciousness

(noun)

Nominative, masculine, singular of cidāditya

cidāditya - sun of consciousness

Compound type : tatpurusha (cit+āditya)

• cit – consciousness, knowledge, understanding
  noun (feminine)
• āditya – sun, son of Aditi
  noun (masculine)

Note: Subject of tapati. Sandhi: cit + ādityaḥ -> cidādityaḥ.

रात्रिंदिवम् (rātriṁdivam) - day and night (day and night, continuously)

(indeclinable)

An adverbial compound. Accusative of time duration.

Compound type : dvandva (rātri+diva)

• rātri – night
  noun (feminine)
• diva – day, heaven
  noun (masculine)

Note: Accusative singular, acting as an adverb of time.

अतन्द्रितः (atandritaḥ) - untiringly, unwearied (untiring, unwearied, diligent, alert)

(adjective)

Nominative, masculine, singular of atandrita

atandrita - unwearied, diligent, active, alert, without sluggishness

Past Passive Participle (negative prefix)

Negation 'a-' + participle from root √tandr (to be weary).

Compound type : nañ-tatpuruṣa (a+tandrita)

• a – not, un-
  indeclinable
  Negative prefix.
• tandrita – wearied, tired, sluggish
  adjective (masculine)
  Past Passive Participle
  From root √tandr (to be weary) + -ta suffix.
  Root: tandr (class 1)

अन्तः (antaḥ) - internally (inside, within, internal)

(indeclinable)

Adverb. Visarga form of antar before pause or voiceless consonant.

Note: Used adverbially.

बहिः (bahiḥ) - externally (outside, externally)

(indeclinable)

Adverb. Visarga form of bahis.

Note: Used adverbially.

शिलाद्यन्तरम् (śilādyantaram) - even within rocks and similar objects (even within rocks etc.)

(noun)

Accusative, neuter, singular of śilādyantara

śilādyantara - interval of stones etc., inside of stones etc.

Compound. 'ādi' indicates 'and so forth'. 'antara' here means 'inside, interval'.

Compound type : tatpurusha (śilā+ādi+antara)

• śilā – rock, stone
  noun (feminine)
• ādi – beginning, et cetera, and so on
  indeclinable
• antara – interior, interval, inside, difference
  noun (neuter)

Note: Accusative used adverbially. Sandhi: śilā-ādi-antaram + api -> śilādyantaram api.

अपि (api) - even (also, even, too)

(indeclinable)

Conjunction/particle.

Note: Sandhi: api + anastamayodayaḥ -> apy anastamayodayaḥ.

अनस्तमयोदयः (anastamayodayaḥ) - without setting or rising

(adjective)

Nominative, masculine, singular of anastamayodaya

anastamayodaya - without setting or rising, having no setting and no rising

Bahuvrīhi compound, meaning 'that for which there is no setting and no rising'.

Compound type : bahuvrīhi (a+astamayodaya)

• a – not, un-
  indeclinable
  Negative prefix.
• astamayodaya – setting and rising
  noun (masculine)
  Dvanda compound.

Note: Agrees with cidādityaḥ. Sandhi: udayaḥ (visarga) before pause.