महाभारतः mahābhārataḥ - book-12, chapter-208, verse-17

धृतिमानात्मवान्बुद्धिं निगृह्णीयादसंशयम् ।
मनो बुद्ध्या निगृह्णीयाद्विषयान्मनसात्मनः ॥१७॥

17. dhṛtimānātmavānbuddhiṁ nigṛhṇīyādasaṁśayam ,
mano buddhyā nigṛhṇīyādviṣayānmanasātmanaḥ.

17. dhṛti-mān ātma-vān buddhim nigṛhṇīyāt asaṃśayam
manaḥ buddhyā nigṛhṇīyāt viṣayān manasā ātmanaḥ

17. dhṛti-mān ātma-vān (puruṣaḥ) asaṃśayam buddhim nigṛhṇīyāt.
buddhyā manaḥ nigṛhṇīyāt,
ātmanaḥ manasā viṣayān (ca) nigṛhṇīyāt

17. One who possesses fortitude and the self (ātman) should undoubtedly restrain the intellect. One should restrain the mind with the intellect, and the sense objects with the mind (that is rooted) in the self (ātman).

Words meanings summery:

• धृति-मान् (dhṛti-mān) - one who possesses fortitude (possessing fortitude, resolute)

• आत्म-वान् (ātma-vān) - possessing the self (ātman) (possessing the self, soulful)

• बुद्धिम् (buddhim) - the intellect (intellect, understanding)

• निगृह्णीयात् (nigṛhṇīyāt) - should restrain (one should restrain, he should control)

• असंशयम् (asaṁśayam) - undoubtedly (without doubt, undoubtedly)

• मनः (manaḥ) - the mind (mind, intellect)

• बुद्ध्या (buddhyā) - with the intellect (by the intellect, with the understanding)

• निगृह्णीयात् (nigṛhṇīyāt) - should restrain (one should restrain, he should control)

• विषयान् (viṣayān) - the sense objects (sense objects, objects of experience)

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

• आत्मनः (ātmanaḥ) - of the self (ātman) (of the self, by the self)

Words meanings and morphology

धृति-मान् (dhṛti-mān) - one who possesses fortitude (possessing fortitude, resolute)

(adjective)

Nominative, masculine, singular of dhṛti-mat

dhṛti-mat - possessed of firmness, resolute, patient

Possessive suffix -mat added to dhṛti (fortitude)

आत्म-वान् (ātma-vān) - possessing the self (ātman) (possessing the self, soulful)

(adjective)

Nominative, masculine, singular of ātma-vat

ātma-vat - possessed of the self/soul, spiritual, firm-minded

Possessive suffix -vat added to ātman (self)

बुद्धिम् (buddhim) - the intellect (intellect, understanding)

(noun)

Accusative, feminine, singular of buddhi

buddhi - intellect, understanding, reason, perception

Derived from root budh

Root: budh (class 1)

निगृह्णीयात् (nigṛhṇīyāt) - should restrain (one should restrain, he should control)

(verb)

3rd person , singular, active, optative (vidhiliṅ) of nigrah

optative mood

3rd person singular active optative from root grah with upasarga ni-

Prefix: ni

Root: grah (class 9)

असंशयम् (asaṁśayam) - undoubtedly (without doubt, undoubtedly)

(indeclinable)

Compound of a- (negation) and saṃśaya (doubt)

Compound type : nañ-tatpuruṣa (a+saṃśaya)

• a – not, non-
  indeclinable
  negative prefix
• saṃśaya – doubt, uncertainty, hesitation
  noun (masculine)
  Derived from root śī with upasarga sam-
  Prefix: sam
  Root: śī (class 2)

मनः (manaḥ) - the mind (mind, intellect)

(noun)

Nominative, neuter, singular of manas

manas - mind, intellect, thought, heart

Note: Used here as the object of nigṛhṇīyāt

बुद्ध्या (buddhyā) - with the intellect (by the intellect, with the understanding)

(noun)

Instrumental, feminine, singular of buddhi

buddhi - intellect, understanding, reason, perception

Derived from root budh

Root: budh (class 1)

निगृह्णीयात् (nigṛhṇīyāt) - should restrain (one should restrain, he should control)

(verb)

3rd person , singular, active, optative (vidhiliṅ) of nigrah

optative mood

3rd person singular active optative from root grah with upasarga ni-

Prefix: ni

Root: grah (class 9)

विषयान् (viṣayān) - the sense objects (sense objects, objects of experience)

(noun)

Accusative, masculine, plural of viṣaya

viṣaya - object of sense, sphere, domain, subject

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

(noun)

Instrumental, neuter, singular of manas

manas - mind, intellect, thought, heart

आत्मनः (ātmanaḥ) - of the self (ātman) (of the self, by the self)

(noun)

Genitive, masculine, singular of ātman

ātman - self, soul, spirit, essence

Note: Can be genitive 'of the self' or ablative 'from the self'.