योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-73, verse-34

ततः प्राक्तनदेहार्थं करिष्ये विपुलं तपः ।
इति संचिन्त्य तपसे देशं निर्णीय सात्मना ॥ ३४ ॥

tataḥ prāktanadehārthaṃ kariṣye vipulaṃ tapaḥ ,
iti saṃcintya tapase deśaṃ nirṇīya sātmanā 34

34. tataḥ prāktanadehārtham kariṣye vipulam tapaḥ
iti saṃcintya tapase deśam nirṇīya sātmanā

34. tataḥ 'prāktanadehārtham vipulam tapaḥ kariṣye'
iti saṃcintya tapase deśam nirṇīya sātmanā

34. Then, thinking, 'I shall perform extensive austerity (tapas) for the sake of my former body,' she, having thus considered and having determined a place for this ascetic practice by herself...

Words meanings summery:

• ततः (tataḥ) - then, thereupon, from that

• प्राक्तनदेहार्थम् (prāktanadehārtham) - for the sake of the former body

• करिष्ये (kariṣye) - I shall do, I shall perform, I will make

• विपुलम् (vipulam) - extensive, great, abundant, vast

• तपः (tapaḥ) - austerity, penance, spiritual practice (tapas)

• इति (iti) - thus, so, in this way

• संचिन्त्य (saṁcintya) - having considered, having thought well, having reflected

• तपसे (tapase) - for austerity, for penance

• देशम् (deśam) - place, region, country

• निर्णीय (nirṇīya) - having decided, having determined, having chosen

• सात्मना (sātmanā) - by herself, with her own self

Words meanings and morphology

ततः (tataḥ) - then, thereupon, from that

(indeclinable)

प्राक्तनदेहार्थम् (prāktanadehārtham) - for the sake of the former body

(noun)

Accusative, neuter, singular of prāktanadehārtha

prāktanadehārtha - the purpose/sake of the former body

Compound type : tatpuruṣa (prāktana+deha+artha)

• prāktana – former, previous, ancient
  adjective (masculine)
• deha – body, physical form
  noun (masculine)
• artha – purpose, aim, meaning, wealth, sake
  noun (masculine)

करिष्ये (kariṣye) - I shall do, I shall perform, I will make

(verb)

1st person , singular, middle, future (lṛṭ) of kṛ

Future indicative

1st person singular future middle (ātmanepada). From root kṛ (class 8, parasmaipada/ātmanepada).

Root: kṛ (class 8)

विपुलम् (vipulam) - extensive, great, abundant, vast

(adjective)

Accusative, neuter, singular of vipula

vipula - extensive, great, abundant, vast

तपः (tapaḥ) - austerity, penance, spiritual practice (tapas)

(noun)

Accusative, neuter, singular of tapas

tapas - austerity, penance, heat, spiritual practice

इति (iti) - thus, so, in this way

(indeclinable)

संचिन्त्य (saṁcintya) - having considered, having thought well, having reflected

(indeclinable)

Absolutive (gerund)

Derived from sam- + cit (class 10) with lyap suffix.

Prefix: sam

Root: cit (class 10)

तपसे (tapase) - for austerity, for penance

(noun)

Dative, neuter, singular of tapas

tapas - austerity, penance, spiritual practice (tapas)

देशम् (deśam) - place, region, country

(noun)

Accusative, masculine, singular of deśa

deśa - place, region, country

निर्णीय (nirṇīya) - having decided, having determined, having chosen

(indeclinable)

Absolutive (gerund)

Derived from nir- + nī (class 1) with lyap suffix.

Prefix: nir

Root: nī (class 1)

सात्मना (sātmanā) - by herself, with her own self

(adjective)

Instrumental, masculine, singular of sātman

sātman - associated with the self, accompanied by the self, oneself

Compound type : avyayībhāva (sa+ātman)

• sa – with, together with
  indeclinable
  Prefix/indeclinable meaning 'with'.
• ātman – self, soul, spirit, essence (ātman)
  noun (masculine)