महाभारतः mahābhārataḥ - book-3, chapter-33, verse-23

मनसार्थान्विनिश्चित्य पश्चात्प्राप्नोति कर्मणा ।
बुद्धिपूर्वं स्वयं धीरः पुरुषस्तत्र कारणम् ॥२३॥

23. manasārthānviniścitya paścātprāpnoti karmaṇā ,
buddhipūrvaṁ svayaṁ dhīraḥ puruṣastatra kāraṇam.

23. manasā arthān viniścitya paścāt prāpnoti karmaṇā
buddhipūrvaṃ svayaṃ dhīraḥ puruṣaḥ tatra kāraṇam

23. A resolute person (puruṣa), having first mentally determined their goals with forethought, subsequently achieves them through action (karma). That person is the underlying cause in such endeavors.

Words meanings summery:

• मनसा (manasā) - by the mind, with the mind

• अर्थान् (arthān) - goals, purposes (goals, purposes, objects, meanings, wealth)

• विनिश्चित्य (viniścitya) - having mentally determined (having determined, having ascertained, having decided)

• पश्चात् (paścāt) - subsequently (afterwards, subsequently, behind)

• प्राप्नोति (prāpnoti) - achieves (obtains, achieves, reaches)

• कर्मणा (karmaṇā) - through action (karma) (by action, through action, by ritual)

• बुद्धिपूर्वं (buddhipūrvaṁ) - with forethought (with forethought, preceded by intelligence)

• स्वयं (svayaṁ) - himself (oneself, by oneself, spontaneously)

• धीरः (dhīraḥ) - a resolute person (the wise one, the resolute one, the firm one)

• पुरुषः (puruṣaḥ) - person (puruṣa) (person, individual, human being, spirit)

• तत्र (tatra) - in such endeavors (there, in that, then, in that case)

• कारणम् (kāraṇam) - the underlying cause (cause, reason, instrument)

Words meanings and morphology

मनसा (manasā) - by the mind, with the mind

(noun)

Instrumental, neuter, singular of manas

manas - mind, intellect, thought, intention

Root: man (class 4)

अर्थान् (arthān) - goals, purposes (goals, purposes, objects, meanings, wealth)

(noun)

Accusative, masculine, plural of artha

artha - purpose, object, goal, meaning, wealth, thing

विनिश्चित्य (viniścitya) - having mentally determined (having determined, having ascertained, having decided)

(indeclinable)

absolutive/gerund

formed from root ści with prefixes vi and ni, and suffix -tya

Prefixes: vi+ni

Root: ści (class 1)

पश्चात् (paścāt) - subsequently (afterwards, subsequently, behind)

(indeclinable)

प्राप्नोति (prāpnoti) - achieves (obtains, achieves, reaches)

(verb)

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

root āp with prefix pra, 5th class verb (śnu)

Prefix: pra

Root: āp (class 5)

कर्मणा (karmaṇā) - through action (karma) (by action, through action, by ritual)

(noun)

Instrumental, neuter, singular of karman

karman - action, deed, work, ritual, fate

Root: kṛ (class 8)

Note: Term karma included in brackets as per instructions.

बुद्धिपूर्वं (buddhipūrvaṁ) - with forethought (with forethought, preceded by intelligence)

(adjective)

neuter, singular of buddhipūrva

buddhipūrva - preceded by intelligence, done with forethought, intentional

Compound type : tatpuruṣa (buddhi+pūrva)

• buddhi – intelligence, understanding, perception, mind
  noun (feminine)
  Root: budh (class 1)
• pūrva – preceded by, before, former, prior
  adjective (masculine)

Note: Used adverbially.

स्वयं (svayaṁ) - himself (oneself, by oneself, spontaneously)

(indeclinable)

Note: Used as an emphatic pronoun.

धीरः (dhīraḥ) - a resolute person (the wise one, the resolute one, the firm one)

(noun)

Nominative, masculine, singular of dhīra

dhīra - wise, resolute, firm, steady, brave

Note: Used substantively as 'the wise one' or 'a resolute person'.

पुरुषः (puruṣaḥ) - person (puruṣa) (person, individual, human being, spirit)

(noun)

Nominative, masculine, singular of puruṣa

puruṣa - person, man, human being, individual, spirit, cosmic person

Note: Term puruṣa included in brackets as per instructions.

तत्र (tatra) - in such endeavors (there, in that, then, in that case)

(indeclinable)

कारणम् (kāraṇam) - the underlying cause (cause, reason, instrument)

(noun)

Nominative, neuter, singular of kāraṇa

kāraṇa - cause, reason, instrument, motive

derived from root kṛ + ana suffix

Root: kṛ (class 8)