महाभारतः mahābhārataḥ - book-13, chapter-130, verse-31

आर्जवो भुवने नित्यं वसत्यमरसंनिधौ ।
तस्मादार्जवनित्यः स्याद्य इच्छेद्धर्ममात्मनः ॥३१॥

31. ārjavo bhuvane nityaṁ vasatyamarasaṁnidhau ,
tasmādārjavanityaḥ syādya iccheddharmamātmanaḥ.

31. ārjavaḥ bhuvane nityam vasati amarasaṃnidhau tasmāt
ārjavanityaḥ syāt yaḥ icchet dharmam ātmanaḥ

31. ārjavaḥ nityam bhuvane amarasaṃnidhau vasati tasmāt
yaḥ ātmanaḥ dharmam icchet ārjavanityaḥ syāt

31. A sincere person (ārjava) always dwells in this world as if in the presence of immortals. Therefore, whoever desires their own (natural law) (dharma) should constantly practice sincerity.

Words meanings summery:

• आर्जवः (ārjavaḥ) - a sincere person (ārjava) (a sincere person, an upright person)

• भुवने (bhuvane) - in the world, in the realm

• नित्यम् (nityam) - always, perpetually, constantly

• वसति (vasati) - dwells, lives, resides

• अमरसंनिधौ (amarasaṁnidhau) - in the presence of immortals/deities

• तस्मात् (tasmāt) - therefore, from that

• आर्जवनित्यः (ārjavanityaḥ) - one whose constant nature is sincerity, always sincere

• स्यात् (syāt) - should be, may be

• यः (yaḥ) - who, whoever

• इच्छेत् (icchet) - desires, wishes

• धर्मम् (dharmam) - one's own (natural law) (dharma) or well-being ((natural law), constitution, righteousness, intrinsic nature)

• आत्मनः (ātmanaḥ) - for oneself, one's own (of the self, for oneself, one's own)

Words meanings and morphology

आर्जवः (ārjavaḥ) - a sincere person (ārjava) (a sincere person, an upright person)

(noun)

Nominative, masculine, singular of ārjava

ārjava - sincerity, uprightness, straightforwardness, integrity (as a quality or a person possessing it)

From ṛju (straight)

भुवने (bhuvane) - in the world, in the realm

(noun)

Locative, neuter, singular of bhuvana

bhuvana - world, earth, realm, dwelling

From root bhū (to be, exist)

Root: bhū (class 1)

नित्यम् (nityam) - always, perpetually, constantly

(indeclinable)

can function as an adverb

Note: Accusative singular neuter of nitya, used adverbially.

वसति (vasati) - dwells, lives, resides

(verb)

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

Present Active

Root vas, class 1, present tense, active voice, 3rd person singular

Root: vas (class 1)

अमरसंनिधौ (amarasaṁnidhau) - in the presence of immortals/deities

(noun)

Locative, masculine, singular of amarasaṃnidhi

amarasaṁnidhi - presence of immortals, vicinity of gods

compound of amara (immortal, god) + saṃnidhi (presence, vicinity)

Compound type : tatpuruṣa (amara+saṃnidhi)

• amara – immortal, god, deity
  noun (masculine)
  Negative compound (nañ-tatpuruṣa) of a + mara (mṛ from mṛ to die)
• saṃnidhi – presence, vicinity, proximity
  noun (masculine)
  From sam + ni + dhā (to place, set)
  Prefixes: sam+ni
  Root: dhā (class 3)

तस्मात् (tasmāt) - therefore, from that

(indeclinable)

ablative singular of 'tad' used adverbially

Note: Ablative singular used adverbially.

आर्जवनित्यः (ārjavanityaḥ) - one whose constant nature is sincerity, always sincere

(adjective)

Nominative, masculine, singular of ārjavanitya

ārjavanitya - one who is perpetually or constantly sincere/upright

compound of ārjava (sincerity) + nitya (constant)

Compound type : bahuvrīhi (ārjava+nitya)

• ārjava – sincerity, uprightness, straightforwardness
  noun (neuter)
  From ṛju (straight)
• nitya – eternal, perpetual, constant, always
  adjective (masculine)

Note: Predicate adjective for the implied subject (one).

स्यात् (syāt) - should be, may be

(verb)

3rd person , singular, active, optative (liṅ) of as

Optative Active

Root as, class 2, optative mood, active voice, 3rd person singular

Root: as (class 2)

यः (yaḥ) - who, whoever

(pronoun)

Nominative, masculine, singular of yad

yad - who, which, what

Note: Subject of 'icchet'.

इच्छेत् (icchet) - desires, wishes

(verb)

3rd person , singular, active, optative (liṅ) of iṣ

Optative Active

Root iṣ, class 6, optative mood, active voice, 3rd person singular

Root: iṣ (class 6)

धर्मम् (dharmam) - one's own (natural law) (dharma) or well-being ((natural law), constitution, righteousness, intrinsic nature)

(noun)

Accusative, masculine, singular of dharma

dharma - natural law, constitution, duty, righteousness, intrinsic nature, merit, virtue

From root dhṛ (to uphold, support)

Root: dhṛ (class 1)

आत्मनः (ātmanaḥ) - for oneself, one's own (of the self, for oneself, one's own)

(noun)

Genitive, masculine, singular of ātman

ātman - self, soul, spirit, vital breath

Root: an (class 2)

Note: Genitive often implies "for" or "of".