"For the soul there is never birth nor death. Nor, having once been, does he ever cease to be. He is unborn, eternal, ever-existing, undying and primeval. He is not slain when the body is slain."
So, in different ways, Kṛṣṇa is trying to convince us how the soul is immortal. Different ways. Ya enaṁ vetti hantāram (BG 2.19). When there is fight, so if one is killed or... So Kṛṣṇa says that if one thinks that "This man has killed this man," so, or "This man can kill this man," this kind of knowledge is not perfect. Nobody kills nobody. Then the butchers, they may say that "Then why do you complain that we are killing?" They're killing the body, but you cannot kill when there is injunction "Thou shall not kill." That means you cannot kill the body even without sanction. You cannot kill. Although the soul is not killed, the body is killed, still you cannot kill the body without sanction. That is sinful. For example, that a man is living in some apartment. So some way or other you drive him away from that, illegally, you drive him away. So the man will go out and will take shelter somewhere. That's a fact. But because you have driven him away from his bona fide position, you are criminal. You cannot say, "Although I have driven away, he'll get some place." No. That's all right, but you have no power to drive him away. He was in his legal position to live in that apartment, and because you have forcibly driven him away you are criminal, you should be punished.
So this argument the butchers or the animal killers or any kind of killer, they cannot put argument. That "Here, Bhagavad-gītā says that soul is never killed, na hanyate hanyamāne śarīre (BG 2.20), even after destroying the body. So why you are complaining that we are killing?" So this is the argument, that you cannot even kill the body. That is not allowed. That is sinful. Ubhau tau na vijānīto nāyaṁ hanti na hanyate (BG 2.19). So nobody kills anybody, neither anybody is killed by others. This is one thing. Again, in a different way, Kṛṣṇa says, na jāyate: the living entity never takes birth. The birth is of the body or the death is of the body. Living entity, the spiritual spark, then that being Kṛṣṇa's part and parcel, as Kṛṣṇa does not take birth, does not die... Ajo 'pi sann avyayātmā (BG 4.6). You'll find in the Fourth Chapter. Ajo 'pi. Kṛṣṇa is aja. Aja means who never takes birth. Similarly, we being part and parcel of Kṛṣṇa, we also never take birth. The birth and death is of this body, and we are so absorbed in the bodily concept of life that when there is birth or death of the body we feel the pains and pleasures. There is no pleasure of course. Birth and death, it is very painful. Because... That is already explained. The consciousness of the soul is spread all over the body. Therefore, the pains and pleasures felt on account of this body. So Kṛṣṇa has already advised that such kinds of pains and pleasure, mātrā-sparśās tu kaunteya (BG 2.14), touching the skin only, one should not be very much bothered. Tāṁs titikṣasva bhārata. In this way if we think about our position, self-realization, how we are different from the body... Actually, this is meditation. If we think very seriously about ourselves and about the body, that is self-realization. Self-realization means I am not this body, I am ahaṁ brahmāsmi, I am spirit soul. That is self-realization.