dehino ’smin yathā dehe kaumāraṁ yauvanaṁ jarā
tathā dehāntara-prāptir dhīras tatra na muhyati || 13||
mātrā-sparśhās tu kaunteya śhītoṣhṇa-sukha-duḥkha-dāḥ
āgamāpāyino ’nityās tāns-titikṣhasva bhārata || 14||
yaṁ hi na vyathayantyete puruṣhaṁ puruṣharṣhabha
sama-duḥkha-sukhaṁ dhīraṁ so ’mṛitatvāya kalpate || 15||
nāsato vidyate bhāvo nābhāvo vidyate sataḥ
ubhayorapi dṛiṣhṭo ’nta stvanayos tattva-darśhibhiḥ|| 16||
avināśhi tu tadviddhi yena sarvam idaṁ tatam
vināśham avyayasyāsya na kaśhchit kartum arhati|| 17||

My Understanding : Krishna explains that if Arjuna’s family faces death, he will feel sorrow, and if they are safe, he will feel joy. However, since death is beyond human control, one must endure both happiness and sorrow as part of life. Arjuna then asks what would happen if they are defeated. Krishna responds that Arjuna’s duty is to perform his responsibilities, accepting whatever results may come with courage and faith.