महाभारतः mahābhārataḥ - book-5, chapter-58, verse-12

निदेशस्थाविमौ यस्य मानसस्तस्य सेत्स्यते ।
संकल्पो धर्मराजस्य निश्चयो मे तदाभवत् ॥१२॥

12. nideśasthāvimau yasya mānasastasya setsyate ,
saṁkalpo dharmarājasya niścayo me tadābhavat.

12. nideśasthau imau yasya mānasaḥ tasya setsyate
saṅkalpaḥ dharmarājasya niścayaḥ me tadā abhavat

12. For whose command these two (Arjuna and Krishna) are ready to abide, the mental resolve (saṅkalpa) of that king of dharma (dharma-rāja) will certainly be fulfilled. This became my firm conviction (niścaya) at that time.

Words meanings summery:

• निदेशस्थौ (nideśasthau) - abiding by command, standing by instruction

• इमौ (imau) - Arjuna and Krishna (these two)

• यस्य (yasya) - whose, of whom

• मानसः (mānasaḥ) - pertaining to the mind, as in 'mental resolve' (mental, of the mind)

• तस्य (tasya) - his, of him, to him

• सेत्स्यते (setsyate) - will be accomplished, will succeed, will be fulfilled

• सङ्कल्पः (saṅkalpaḥ) - resolve, determination, intention (saṅkalpa)

• धर्मराजस्य (dharmarājasya) - of Yudhishthira (the king of dharma) (of the king of dharma, of the king of justice (dharma-rāja))

• निश्चयः (niścayaḥ) - firm resolve, certainty, conviction

• मे (me) - my (conviction) (my, to me)

• तदा (tadā) - then, at that time

• अभवत् (abhavat) - became, was

Words meanings and morphology

निदेशस्थौ (nideśasthau) - abiding by command, standing by instruction

(adjective)

Nominative, masculine, dual of nideśastha

nideśastha - abiding by an order, obedient, standing by instructions

Compound type : tatpuruṣa (nideśa+stha)

• nideśa – command, instruction, direction
  noun (masculine)
• stha – standing, situated, abiding
  adjective (masculine)
  Derived from root sthā- (to stand)
  Root: sthā (class 1)

इमौ (imau) - Arjuna and Krishna (these two)

(pronoun)

Nominative, masculine, dual of idam

idam - this, these

यस्य (yasya) - whose, of whom

(pronoun)

Genitive, masculine, singular of yad

yad - who, which, what (relative pronoun)

मानसः (mānasaḥ) - pertaining to the mind, as in 'mental resolve' (mental, of the mind)

(adjective)

Nominative, masculine, singular of mānasa

mānasa - mental, relating to the mind, produced by the mind

Note: Qualifies saṅkalpaḥ

तस्य (tasya) - his, of him, to him

(pronoun)

Genitive, masculine, singular of tad

tad - that, he, she, it (demonstrative pronoun)

सेत्स्यते (setsyate) - will be accomplished, will succeed, will be fulfilled

(verb)

3rd person , singular, middle, future indicative (lṛṭ) of sidh

Root: sidh (class 4)

सङ्कल्पः (saṅkalpaḥ) - resolve, determination, intention (saṅkalpa)

(noun)

Nominative, masculine, singular of saṅkalpa

saṅkalpa - resolve, determination, intention, firm purpose (saṅkalpa)

Prefix: sam

Root: kḷp

धर्मराजस्य (dharmarājasya) - of Yudhishthira (the king of dharma) (of the king of dharma, of the king of justice (dharma-rāja))

(noun)

Genitive, masculine, singular of dharmarāja

dharmarāja - king of dharma, king of justice, Yama (dharma-rāja)

Compound type : tatpuruṣa (dharma+rājan)

• dharma – righteous conduct, moral duty, natural law (dharma)
  noun (masculine)
• rājan – king, ruler
  noun (masculine)

निश्चयः (niścayaḥ) - firm resolve, certainty, conviction

(noun)

Nominative, masculine, singular of niścaya

niścaya - certainty, firm resolve, conviction, decision

Prefix: nis

Root: ci

मे (me) - my (conviction) (my, to me)

(pronoun)

Genitive, singular of asmad

asmad - I, me (first person pronoun)

Note: Here, it functions as a genitive ('my conviction').

तदा (tadā) - then, at that time

(indeclinable)

अभवत् (abhavat) - became, was

(verb)

3rd person , singular, active, past imperfect (laṅ) of bhū

Root: bhū (class 1)