avacya-vadams ca bahun vadisyanti tavahitah nindantas tava samarthyam tato duhkhataram nu kim
Translation
Your enemies will describe you in many unkind words and scorn your ability. What could be more painful for you?
Purport
After explaining Arjuna about the social consequences of not performing his prescribed duty, Bhagvan Shri Krishna explained Arjuna that performing duty is always the best option for human being. There is never a loss in performing duty.
Talking specifically on Kshastriya Dharm, Bhagvan said that a warrior who dies fighting for dharma and humanity if dies achieves the highest planets. And if he wins he enjoys the sovereignty of land. Therefore he should fight for protection of Dharma as this is his natural duty.
