योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-21, verse-29

ततः प्राप्स्यस्यसंदेहं व्योमात्मानं नभःस्थितम् ।
भूमिष्ठनरसंकल्पो गगनान्तः पुरं यथा ॥ २९ ॥

tataḥ prāpsyasyasaṃdehaṃ vyomātmānaṃ nabhaḥsthitam ,
bhūmiṣṭhanarasaṃkalpo gaganāntaḥ puraṃ yathā 29

29. tataḥ prāpsyasi asandeham vyomātmānam nabhaḥsthitam
bhūmiṣṭhanarasaṅkalpaḥ gaganāntaḥpuram yathā

29. tataḥ asandeham vyomātmānam nabhaḥsthitam prāpsyasi.
yathā bhūmiṣṭhanarasaṅkalpaḥ gaganāntaḥpuram (prāpnoti).

29. Thereafter, you will undoubtedly attain the Self (ātman) of the ether, which is situated in the sky. This is just as a human's resolve, even while situated on earth, reaches the inner palace of the sky.

Words meanings summery:

• ततः (tataḥ) - then, thereafter, from there

• प्राप्स्यसि (prāpsyasi) - you will attain, you will reach

• असन्देहम् (asandeham) - without doubt, certainly, surely

• व्योमात्मानम् (vyomātmānam) - the Self (ātman) of the ether/sky

• नभःस्थितम् (nabhaḥsthitam) - situated in the sky/ether, abiding in space

• भूमिष्ठनरसङ्कल्पः (bhūmiṣṭhanarasaṅkalpaḥ) - a human's resolve situated on earth

• गगनान्तःपुरम् (gaganāntaḥpuram) - the inner palace of the sky, the celestial inner chambers

• यथा (yathā) - just as, as, in the manner that

Words meanings and morphology

ततः (tataḥ) - then, thereafter, from there

(indeclinable)

Ablative of 'tad' used as an indeclinable.

प्राप्स्यसि (prāpsyasi) - you will attain, you will reach

(verb)

2nd person , singular, active, future (lṛṭ) of prāp

Root 'āp' with prefix 'pra'.

Prefix: pra

Root: āp (class 5)

असन्देहम् (asandeham) - without doubt, certainly, surely

(adjective)

Accusative, masculine, singular of asandeha

asandeha - without doubt, certain, sure

Negative particle 'a' + 'sandeha' (doubt). Used adverbially here.

Compound type : nañ-tatpuruṣa (a+sandeha)

• a – not, non-, un-
  indeclinable
  Negative prefix.
• sandeha – doubt, uncertainty
  noun (masculine)

Note: Used adverbially (accusative singular neuter or adverbial suffix 'am').

व्योमात्मानम् (vyomātmānam) - the Self (ātman) of the ether/sky

(noun)

Accusative, masculine, singular of vyomātman

vyomātman - the Self of the ether, the cosmic Self as pervasive as space

Compound of Vyoma (ether, sky) and Ātman (Self).

Compound type : ṣaṣṭhī-tatpuruṣa (vyoman+ātman)

• vyoman – sky, heaven, ether, space
  noun (neuter)
• ātman – Self, soul, spirit, essence
  noun (masculine)

नभःस्थितम् (nabhaḥsthitam) - situated in the sky/ether, abiding in space

(adjective)

Accusative, masculine, singular of nabhaḥsthita

nabhaḥsthita - situated in the sky, existing in space

Compound of Nabhas (sky, atmosphere) and Sthita (situated, standing).

Compound type : saptamī-tatpuruṣa (nabhas+sthita)

• nabhas – sky, atmosphere, ether, space
  noun (neuter)
• sthita – situated, standing, abiding, firm
  adjective (masculine)
  Past Passive Participle
  Derived from root 'sthā' (to stand).
  Root: sthā (class 1)

Note: Agrees with 'vyomātmānam'.

भूमिष्ठनरसङ्कल्पः (bhūmiṣṭhanarasaṅkalpaḥ) - a human's resolve situated on earth

(noun)

Nominative, masculine, singular of bhūmiṣṭhanarasaṅkalpa

bhūmiṣṭhanarasaṅkalpa - a human's resolve/intention (saṅkalpa) abiding on earth

Compound of Bhūmiṣṭha (situated on earth) + Nara (human) + Saṅkalpa (resolve).

Compound type : tatpuruṣa or karmaśīla-tatpuruṣa (bhūmiṣṭha+nara+saṅkalpa)

• bhūmiṣṭha – situated on earth, earthly
  adjective (masculine)
  Compound of Bhūmi (earth) + Stha (standing, situated).
  Root: sthā (class 1)
• nara – man, human being
  noun (masculine)
• saṅkalpa – resolve, intention, determination, will
  noun (masculine)
  Derived from 'sam' (together) + 'kḷp' (to arrange).
  Prefix: sam
  Root: kḷp (class 1)

गगनान्तःपुरम् (gaganāntaḥpuram) - the inner palace of the sky, the celestial inner chambers

(noun)

Accusative, neuter, singular of gaganāntaḥpura

gaganāntaḥpura - the inner palace of the sky/heaven

Compound of Gagana (sky) and Antaḥpura (inner palace).

Compound type : ṣaṣṭhī-tatpuruṣa (gagana+antaḥpura)

• gagana – sky, heaven, atmosphere
  noun (neuter)
• antaḥpura – inner palace, women's apartments, seraglio
  noun (neuter)
  Compound of Antar (within, inner) and Pura (city, stronghold, palace).

यथा (yathā) - just as, as, in the manner that

(indeclinable)

Derived from 'yad' (which) + 'thā(l)' suffix indicating manner.