मृत्यु-काल-प्रबोधनम् (Instruction on Mortality, Time, and Truth) — Mahābhārata, Śānti-parva 169
ये च दोषसमायुक्ता नराः प्रोक्ता मयानघ
bhīṣma uvāca | ye ca doṣa-samāyuktā narāḥ proktā mayānagha, niṣpāpa nareśa! teṣāṃ sarveṣām adhamo bhavati kṛtaghnaḥ | sa mitra-vadhyam api karoti | tādṛśān durācārān narādhamān dūrata eva tyajet | eṣa sarveṣāṃ niścayaḥ |
ビーシュマは言った。「咎なき王よ、わたしが過失に染まる者として述べた人々のうち、最も卑しいのは恩知らずである。その者は友をさえ殺すところまで堕ちうる。ゆえに、かかる邪悪にして行いの乱れた下劣な者どもは、遠くからでも捨て去るべきだ。これは万人の定まった見解である。」
भीष्म उवाच
Gratitude is a foundational virtue in dharma; ingratitude (kṛtaghnatā) marks the lowest character because it can drive a person to betray and even destroy benefactors and friends. Such people should be avoided decisively.
In Bhishma’s instruction to the king during the Śānti Parva, he classifies moral faults and singles out the ungrateful person as the worst, advising the ruler to keep distance from such corrupt individuals for personal and social safety.