Now, you should know there are two kinds of prakṛti. Prakṛti means nature. You'll find it in the Seventh Chapter of Bhagavad-gītā that the Lord says that He has got two . . . why Lord says? In the Vedic scripture also we'll find, parāsya śaktir vividhaiva śrūyate (Śvetāśvatara Upaniṣad 6.8); "There are different kinds of nature of the Supreme." Svābhāvikī jñāna-bala-kriyā ca. So out of many kinds of nature of the Supreme Lord, they have divided the whole thing into three division. One is called external nature and the other is called internal nature. And there is another nature, which is called marginal nature. The external nature, the material world, manifestation of this material world, is external nature. And this is described in the Bhagavad-gītā, as we'll find it in the Seventh Chapter, that apareyam. Aparā. Aparā means inferior or lower nature. Lower nature. So He has got higher nature.
One may question that "Why? The Supreme Lord is all-good. Why He has got higher nature and lower nature?" Yes, He has got, because He says. You cannot say that there is no higher nature and lower nature. There is also higher nature. Now, here the Lord says that "When I come as incarnation, when I appear . . ." Prakṛtiṁ svām adhiṣṭhāya. Svām means His higher nature. He does not accept this material nature. He does not accept this material nature.
Just the example . . . we can give very tangible example. Just like in the prison house sometimes the head of the country goes to visit, to see, to inspect how the prison life is going on or to give them some instruction, some good lessons that, "Why you are rotting in prison? You become good citizen."
Now, suppose the head of the state goes to the prison and to instruct the prisoners, and if the prisoners think, "Oh, he is also a prisoner. The head of the state who has come to instruct, he is also one of the prisoners, like us." So similarly, if we think that Kṛṣṇa is like us—He is also assumed the material body and He is one of us—then it is a mistake. Then it is a mistake.