महाभारतः mahābhārataḥ - book-8, chapter-5, verse-24

ईदृशैर्यद्यहं दुःखैर्न विनश्यामि संजय ।
वज्राद्दृढतरं मन्ये हृदयं मम दुर्भिदम् ॥२४॥

24. īdṛśairyadyahaṁ duḥkhairna vinaśyāmi saṁjaya ,
vajrāddṛḍhataraṁ manye hṛdayaṁ mama durbhidam.

24. īdṛśaiḥ yadi aham duḥkhaiḥ na vinaśyāmi sañjaya
| vajrāt dṛḍhataraṃ manye hṛdayaṃ mama durbhidam

24. sañjaya,
yadi aham īdṛśaiḥ duḥkhaiḥ na vinaśyāmi,
(tadā) mama hṛdayaṃ vajrāt dṛḍhataram durbhidam (iti) manye.

24. O Sañjaya, if I am not destroyed by such sorrows, then I consider my heart to be harder than a thunderbolt and indeed unbreakable.

Words meanings summery:

• ईदृशैः (īdṛśaiḥ) - by such, of this kind

• यदि (yadi) - if

• अहम् (aham) - I

• दुःखैः (duḥkhaiḥ) - by sorrows, by sufferings

• न (na) - not, no

• विनश्यामि (vinaśyāmi) - I perish, I am destroyed

• सञ्जय (sañjaya) - O Sañjaya

• वज्रात् (vajrāt) - than a thunderbolt, from a thunderbolt

• दृढतरम् (dṛḍhataram) - harder, stronger (comparative)

• मन्ये (manye) - I think, I believe, I consider

• हृदयम् (hṛdayam) - heart, mind

• मम (mama) - my, of me

• दुर्भिदम् (durbhidam) - unbreakable (difficult to break, impenetrable, unbreakable)

Words meanings and morphology

ईदृशैः (īdṛśaiḥ) - by such, of this kind

(adjective)

Instrumental, masculine, plural of īdṛś

īdṛś - such, of this kind

Note: agrees with duḥkhaiḥ

यदि (yadi) - if

(indeclinable)

अहम् (aham) - I

(pronoun)

Nominative, singular of asmad

asmad - I (first person pronoun)

दुःखैः (duḥkhaiḥ) - by sorrows, by sufferings

(noun)

Instrumental, neuter, plural of duḥkha

duḥkha - sorrow, suffering, pain, unhappiness

न (na) - not, no

(indeclinable)

विनश्यामि (vinaśyāmi) - I perish, I am destroyed

(verb)

1st person , singular, active, present (laṭ) of vinaś

Present Indicative

vi + root naś, present tense, 1st person singular

Prefix: vi

Root: naś (class 4)

सञ्जय (sañjaya) - O Sañjaya

(proper noun)

Vocative, masculine, singular of sañjaya

sañjaya - Sanjaya (the charioteer and reporter to Dhṛtarāṣṭra)

वज्रात् (vajrāt) - than a thunderbolt, from a thunderbolt

(noun)

Ablative, masculine, singular of vajra

vajra - thunderbolt (weapon of Indra); diamond

Note: used with comparative dṛḍhataram

दृढतरम् (dṛḍhataram) - harder, stronger (comparative)

(adjective)

Accusative, neuter, singular of dṛḍhatara

dṛḍhatara - harder, stronger, firmer (comparative)

dṛḍha + -tara suffix (comparative)

Note: agrees with hṛdayam

मन्ये (manye) - I think, I believe, I consider

(verb)

1st person , singular, middle, present (laṭ) of man

Present Indicative

root man, present tense, 1st person singular, middle voice

Root: man (class 4)

हृदयम् (hṛdayam) - heart, mind

(noun)

Accusative, neuter, singular of hṛdaya

hṛdaya - heart, mind, soul

मम (mama) - my, of me

(pronoun)

Genitive, singular of asmad

asmad - I (first person pronoun)

दुर्भिदम् (durbhidam) - unbreakable (difficult to break, impenetrable, unbreakable)

(adjective)

Accusative, neuter, singular of durbhida

durbhida - difficult to break, hard to penetrate, unbreakable

dur (difficult) + root bhid (to break) + a (suffix)

Compound type : tatpuruṣa (dur+bhid)

• dur – bad, difficult, hard
  indeclinable
  prefix indicating difficulty
• bhid – to break, to split
  verb
  Root: bhid (class 7)

Note: agrees with hṛdayam