A class on Bhagavad Gita 2.26-27 given by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada on August 29, 1973 in London.
Bhagavad Gita 2.26
atha cainaṁ nitya-jātaṁ
nityaṁ vā manyase mṛtam
tathāpi tvaṁ mahā-bāho
nainaṁ śocitum arhasi
If, however, you think that the soul [or the symptoms of life] will always be born and die forever, you still have no reason to lament, O mighty-armed.
Bhagavad Gita 2.27
jātasya hi dhruvo mṛtyur
dhruvaṁ janma mṛtasya ca
tasmād aparihārye ’rthe
na tvaṁ śocitum arhasi
One who has taken his birth is sure to die, and after death one is sure to take birth again. Therefore, in the unavoidable discharge of your duty, you should not lament.