Link:-In the next two verses, Lord Krsna says, that even if one thinks of the soul as changeable, (which is against the basic (principle), one should not grieve.
atha cainam nityajatam nityam va manyase mrtam
tathhpi tvam mahahaho naivam socitumarhas
0 mighty-armed, even if you suppose this soul as constantly undergoing birth and death, even then, you should not
grieve over it. 26
Atha cainam nityajatam nityam va manyase mrtam lathapi tvam mahabaho naivam socitumarhasi:-Lord Krsna, by using the
terms, such as'atha ca and 'manyase' means that it is a fact that the soul is unborn (Gita 2/20), yet if you accept the contrary, you should not gtieve, because one who is born is bound to die, and one who dies, is bound to be reborn. None can escape this eternal rule.
A seed sown in the earth, assumes different shapes—sprout, plant, tree and then it dries up and decays. The fact is, that the seed undergoes change, every moment. If this seed had remained the same, even for a moment; how had it passed different stages upto the last one of its drying up, as a tree? It gave up its prior form—it is its death; and it assumes a new shape—it is its birth. Thus it passes, through birth and death, every moment. Similarly, this body also undergoes a change, every moment. Sperm gets mixed with ovum and the mixture, grows into a baby which is born. With its birth, the process of death sets in, which culminates in death. Thus, this body undergoes a continuous change i.e., it is born, it decays and dies.
Therefore Lord Krsna says to Arjuna that even if he holds the view that the soul undergoes birth and death like a body, there is still no ground for grieving.