Bhagavad-gītā. Mattaḥ sarvaṁ pravartate (BG 10.8). This is the explanation Kṛṣṇa is giving. Mattaḥ parataraṁ nānyat kiñcid asti dhanañjaya (BG 7.7). We should understand this. So beginning is the Kṛṣṇa, ādi. Īśvaraḥ paramaḥ kṛṣṇaḥ sac-cid-ānanda vigrahaḥ, anādir ādiḥ (BS 5.1). Anādi: He has no beginning. And everything has got beginning, and anta, but Kṛṣṇa has no beginning and anta. Ādy-anta. So in this way we have to understand Kṛṣṇa. And one who has such perfect understanding of Kṛṣṇa . . . And Kṛṣṇa says, aham ādir hi devānām (BG 10.2). Devānām means beginning from Brahmā, then Śiva, then so many other demigods, Indra, Candra, Varuṇa. Aham . . . Even Viṣṇu. The Viṣṇu, Kṣirodakaśāyī Viṣṇu, He is also partial expansion of Kṛṣṇa, and from Kṣirodakaśāyī Viṣṇu the Viṣṇu is all-pervading. Īśvaraḥ sarva-bhūtānāṁ hṛd-deśe 'rjuna tiṣṭhati (BG 18.61): the Supreme Personality of Godhead who is staying in everyone's core of heart, hṛd-deśe. It is . . . There is no hide and seek, hide and seek. It is clearly stated that "This Paramātmā, Viṣṇu, is staying, hṛd, hṛd-deśe, in the heart." Therefore heart is always palpitating. And the jīvātmā is also there and . . . (aside:) Stop children talking. Then when the jīvātmā leaves this body, that is called heart failure. That is heart failure. Heart is palpulating, but as soon as the jīvātmā goes, heart fails. And these materialist science, they cannot give any cause. They are giving, what is that, oxygen gas and every minute injecting to keep the palpitation of the heart, throbbing of the heart, continuous. But how they can do it? As soon as the living soul is depart from the heart there is no more palpitating. It is simply a lump of matter. That requires intelligence, that this matter is never the living soul.
Therefore anyone who is accepting this body as self, they have been described in the śāstra no better than . . . Sa eva go-kharaḥ (SB 10.84.13). Go means cows, and khara means asses. These are asses. They are taking so much credit, advancement of scientific knowledge, but so long they do not understand there is soul—dehino 'smin yathā dehe (BG 2.13)—they are all asses, that's all, simply asses. This is our challenge, that "You are all asses. If you do not accept the existence of the soul, if you cannot find out where it is, then you are all asses. We don't give you any credit." This is our challenge. Let anyone come. We shall prove that he's an ass. We shall prove. How? It is very easy. Any intelligent man can analyze this body. Take this breathing. What is this breathing? It is air. Now, you are very much anxious to keep the breathing going on by oxygen gas and injection. What is the use of oxygen gas? If breathing is lost, you can put some air within, just like the bellow, and by machine, by some electric arrangement, the bellow can go on and the breathing will come out. Why don't you do that? It is very easy. Anyone can do it. And not anyone; at least one who has got some mechanical idea. So do you think that the breathing will bring the life? Do you think? It is not possible, sir. It is air only. That is not possible. Then you take the blood. What is this blood? The blood is nothing but red water. You cannot say that injecting some red water, you can bring life. Analyze it very intelligently. Then what is the composition of this body? The air or the water, the same. Bhūmir āpo 'nalo vāyuḥ (BG 7.4). It is said here, mahad-ādayo. Mahat-tattva and its expansion. Even in the subtle mind, manaḥ prabhṛtayo, mind, intelligence, egotism, you analyze everything, but you won't find there the life. No. That is not possible.
Therefore, if you are intelligent enough, you take one ingredient of this body. One after another, one after another, one after another, you analyze. You won't find. Neither with that ingredient you can create life. That is not possible. This is analysis. You are very expert in analyzing things in the laboratory and charge fees, chemical analysis. But this is also composition of these chemical. But they say "chemical evolution." That's right, evolution. It has come, life. Then, when life is lost, why don't you combine these chemicals, bring life? That is not possible. Therefore, by proper analysis one must come to the conclusion that these ingredients are different from the living force. Then . . . That is called self-realization. Ahaṁ brahmāsmi: "I am not this matter." That is the first step of knowledge. Brahma-bhūtaḥ prasannātmā (BG 18.54). "Oh, I was so much busy with this lump of matter. Now I understand that I am spirit soul," ahaṁ brahmāsmi. This is the first realization, self-realization.