Mahabharata 8.5.24

ईदृशैर्यद्यहं दुःखैर्न विनश्यामि संजयवज्राद्दृढतरं मन्ये हृदयं मम दुर्भिदम्

īdṛśairyadyahaṃ duḥkhairna vinaśyāmi saṃjayavajrāddṛḍhataraṃ manye hṛdayaṃ mama durbhidam

Our plain-language meaning of this verse is waiting for scholar review.