योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-23, verse-28

तस्मादनन्तसिद्ध्यर्थं शाश्वताय सुखाय च ।
तज्जये यत्नमातिष्ठ कष्टयापि हि चेष्टया ॥ २८ ॥

tasmādanantasiddhyarthaṃ śāśvatāya sukhāya ca ,
tajjaye yatnamātiṣṭha kaṣṭayāpi hi ceṣṭayā 28

28. tasmāt anantasiddhyartham śāśvatāya sukhāya ca
tat jaye yatnam ātiṣṭha kaṣṭayā api hi ceṣṭayā

28. tasmāt anantasiddhyartham ca śāśvatāya sukhāya tat jaye kaṣṭayā api hi ceṣṭayā yatnam ātiṣṭha.

28. Therefore, for the sake of infinite accomplishment and for eternal happiness, exert effort to conquer that (foe/quality), even through strenuous endeavor.

Words meanings summery:

• तस्मात् (tasmāt) - therefore (therefore, from that, for that reason)

• अनन्तसिद्ध्यर्थम् (anantasiddhyartham) - for the sake of infinite accomplishment (for the sake of infinite accomplishment/perfection)

• शाश्वताय (śāśvatāya) - for eternal (happiness) (for the eternal, for eternity)

• सुखाय (sukhāya) - for happiness (for happiness, for pleasure)

• च (ca) - and (and, also)

• तत् (tat) - that (foe/quality, referring back to the 'tasmin' of the previous verse) (that, it)

• जये (jaye) - in conquering (that) (in conquest, in victory, for the sake of conquering)

• यत्नम् (yatnam) - effort (effort, exertion, endeavor)

• आतिष्ठ (ātiṣṭha) - exert (effort), undertake (stand firm, apply, undertake, exert)

• कष्टया (kaṣṭayā) - even with a difficult (endeavor) (by difficulty, by hardship; difficult, hard)

• अपि (api) - even (with) (also, even, too)

• हि (hi) - indeed, surely (indeed, surely, for, because)

• चेष्टया (ceṣṭayā) - by (strenuous) endeavor (by effort, by endeavor, by action)

Words meanings and morphology

तस्मात् (tasmāt) - therefore (therefore, from that, for that reason)

(pronoun)

Ablative, masculine/neuter, singular of tad

tad - that, he, she, it

Note: Used here adverbially to mean 'therefore'.

अनन्तसिद्ध्यर्थम् (anantasiddhyartham) - for the sake of infinite accomplishment (for the sake of infinite accomplishment/perfection)

(noun)

Accusative, neuter, singular of anantasiddhyartha

anantasiddhyartha - for the purpose of endless success/perfection

Compound noun, used adverbially in accusative for purpose.

Compound type : tatpuruṣa (ananta+siddhi+artha)

• ananta – infinite, endless, boundless
  adjective (masculine)
  Formed by 'an-' (negation) + 'anta' (end).
  Prefix: an
• siddhi – accomplishment, success, perfection, supernatural power
  noun (feminine)
  From root 'sidh' (to accomplish).
  Root: sidh (class 4)
• artha – purpose, meaning, wealth, goal, sake
  noun (masculine)

Note: Used adverbially.

शाश्वताय (śāśvatāya) - for eternal (happiness) (for the eternal, for eternity)

(adjective)

Dative, masculine/neuter, singular of śāśvata

śāśvata - eternal, perpetual, everlasting

Derived from 'śaśvat' (always) + 'aṇ' suffix.

Note: Agrees with 'sukhāya'.

सुखाय (sukhāya) - for happiness (for happiness, for pleasure)

(noun)

Dative, neuter, singular of sukha

sukha - happiness, ease, pleasure, joy

Note: Expresses purpose.

च (ca) - and (and, also)

(indeclinable)

Conjunction.

Note: Connects 'anantasiddhyartham' and 'śāśvatāya sukhāya'.

तत् (tat) - that (foe/quality, referring back to the 'tasmin' of the previous verse) (that, it)

(pronoun)

neuter, singular of tad

tad - that, he, she, it

Note: Acts as the object of the implied verbal action in 'jaye'.

जये (jaye) - in conquering (that) (in conquest, in victory, for the sake of conquering)

(noun)

Locative, masculine, singular of jaya

jaya - victory, conquest, triumph

From root 'ji' (to conquer).

Root: ji (class 1)

Note: 'tat jaye' means 'in the conquest of that'.

यत्नम् (yatnam) - effort (effort, exertion, endeavor)

(noun)

Accusative, masculine, singular of yatna

yatna - effort, exertion, endeavor, attempt

From root 'yat' (to strive).

Root: yat (class 1)

आतिष्ठ (ātiṣṭha) - exert (effort), undertake (stand firm, apply, undertake, exert)

(verb)

2nd person , singular, active, imperative (loṭ) of ā + sthā

Imperative, Second Person Singular

From root 'sthā' (class 1, parasmaipada) with upasarga 'ā'.

Prefix: ā

Root: sthā (class 1)

कष्टया (kaṣṭayā) - even with a difficult (endeavor) (by difficulty, by hardship; difficult, hard)

(adjective)

Instrumental, feminine, singular of kaṣṭa

kaṣṭa - difficult, painful, troublesome, evil

अपि (api) - even (with) (also, even, too)

(indeclinable)

हि (hi) - indeed, surely (indeed, surely, for, because)

(indeclinable)

Emphatic or explanatory particle.

Note: Adds emphasis.

चेष्टया (ceṣṭayā) - by (strenuous) endeavor (by effort, by endeavor, by action)

(noun)

Instrumental, feminine, singular of ceṣṭā

ceṣṭā - effort, exertion, action, gesture, attempt

From root 'ceṣṭ' (to move, to endeavor).

Root: ceṣṭ (class 1)

Note: Means by means of endeavor.