जातस्य हि ध्रुवो मृत्युर्ध्रुवं जन्म मृतस्य च। तस्मादपरिहार्येऽर्थे न त्वं शोचितुमर्हसि ॥

jātasya hi dhruvo mṛityur dhruvaṁ janma mṛitasya cha tasmād aparihārye ’rthe na tvaṁ śhochitum arhasi

For certain is death for the born, and certain is birth for the dead; therefore over the inevitable thou shouldst not grieve.

In plain words: Everyone who is born will surely die, and everyone who dies will surely be born again. So Arjuna should not grieve over what cannot be avoided.