Even if Arjuna did not believe in the existence of the soul—as in the Vaibhasika philosophy—there would still have been no cause for lamentation. No one laments the loss of a certain bulk of chemicals and stops discharging his prescribed duty. On the other hand, in modern science and scientific warfare, so many tons of chemicals are wasted for achieving victory over the enemy. According to the Vaibhasika philosophy, the so-called soul or atma vanishes along with the deterioration of the body. So, in any case, whether Arjuna accepted the Vedic conclusion that there is an atomic soul, or whether he did not believe in the existence of the soul, he had no reason to lament. According to this theory, since there are so many living entities generating out of matter every moment, and so many of them are being vanquished every moment, there is no need to grieve for such an incidence. However, since he was not risking rebirth of the soul, Arjuna had no reason to be afraid of being affected with sinful reactions due to his killing his grandfather and teacher. But at the same time, Krsna sarcastically addressed Arjuna as maha-bahu, mighty-armed, because He, at least, did not accept the theory of the Vaibhasikas, which leaves aside the Vedic wisdom. As a ksatriya, Arjuna belonged to the Vedic culture, and it behooved him to continue to follow its principles.