Bhagavad Gita

ಅವಾಚ್ಯವಾದಾಂಶ್ಚ ಬಹೂನ್ ವದಿಷ್ಯಂತಿ ತವಾಹಿತಾಃ ।
ನಿಂದಂತಸ್ತವ ಸಾಮರ್ಥ್ಯಂ ತತೋ ದುಃಖತರಂ ನು ಕಿಮ್ ॥೩೬॥
avācyavādāṃśca bahūn vadiṣyaṃti tavāhitāḥ |
niṃdaṃtastava sāmarthyaṃ tato duḥkhataraṃ nu kim ||36||

Gist of the sloka:
Those who are your enemies, would mock you and would humiliate you in many cruel words. What else is there, which could cause a greater pain to a warrior?
Lord Krishna stresses again and again the consequences for the rest of the life of Arjun if he withdraws and how painful it would be. One action would not only wipe out his past achievements but all the reputation built up so diligently over multiple decades.
Lord Krishna is trying to explain to Arjuna how the society perceives. Its memory is short. Similar would be the case of a judge. If he decides in favor of his relatives because of his connect with them, no matter how judicious he was before, his reputation is in tatters within seconds. Every judgement he has given until now would now be suspect and those affected by it would curse the judge.