So in all the Vedas, Upaniṣads, Saṁhitās, the same thing is described in different way. Nityo nityānāṁ cetanaś cetanānām (Kaṭha Upaniṣad 2.2.13), in this way. Here Kṛṣṇa Himself describes Himself that ajo 'pi and avyayātmā. Avyayātmā. It does . . . Kṛṣṇa's body, mind, there is no difference—absolute. What is Kṛṣṇa's body, that is Kṛṣṇa's soul. What is Kṛṣṇa's mind, that is Kṛṣṇa's soul. Or what is Kṛṣṇa's soul, that is Kṛṣṇa's body, that is Kṛṣṇa. Avyayātmā. Ajo 'pi sann avyayātmā bhūtānām īśvaraḥ. Īśvaraḥ. He's not ordinary living being. Bhūtānām īśvaraḥ. That is the difference. He's īśvaraḥ. We are not īśvaraḥ. We may be īśvaraḥ. Īśvaraḥ means controller. But that, we are not the supreme īśvara. The supreme īśvara is called Kṛṣṇa. Īśvaraḥ paramaḥ kṛṣṇaḥ (Bs. 5.1). We are not supreme īśvara.
The so-called incarnation of God, they declare that "I am God." But . . . He may be God, God means a subordinate god. Not the Supreme God. The Supreme God is Kṛṣṇa. God means controller. You have . . . you may have some controlling power, admitted, but you are not Supreme Controller. The Supreme Controller is Īśvara. Therefore here Kṛṣṇa . . . therefore Kṛṣṇa says, bhūtānām īśvaro 'pi. Īśvaraḥ. All bhūta . . . bhūtānām means all living entities, or everything which has appeared within this material world. Janmādy asya yataḥ (SB 1.1.1): He is the supreme source of everything. That is also described in the Tenth Chapter that aham ādir hi devānām (BG 10.2), mattaḥ sarvaṁ pravartate. Everything. Mattaḥ parataraṁ nānyat kiñcid asti dhanañjaya (BG 7.7). These things are described.
So we have to accept Kṛṣṇa like that. And if we make our own interpretation, rascal-like, that will not help us to understand what is Kṛṣṇa and what is Bhagavad-gītā. That is going on, generally. "Kṛṣṇa has no existence," "Kṛṣṇa, there was no Kṛṣṇa. It is story," "There was no Battlefield of Kurukṣetra." These things are going on by . . . spoken by so-called political leaders and scholars. But that is not the fact. They do not understand Kṛṣṇa; simply mislead people. Therefore the world is in chaotic condition. Try to understand Kṛṣṇa. Then your life will be successful. Kṛṣṇa is explaining. Kṛṣṇa is so kind that . . . yadā yadā hi dharmasya (BG 4.7). He'll explain that, why He comes. Ajo 'pi sann avyayātmā bhūtānām īśvaro 'pi san sambhavāmi yuge yuge, why? Just to remind us what is Kṛṣṇa. Just to teach us. Because we misunderstand. We are so fools and rascals, we misunderstand Kṛṣṇa. We cannot understand. If we simply understand Kṛṣṇa, then our life is successful. Tyaktvā dehaṁ punar janma naiti mām eti kaunteya (BG 4.9). The simple thing. Just try to understand Kṛṣṇa. This simple, one thing will make your life successful.