Prabhupāda: You have heard the name of Bhagavad-gītā? Have you, any of you?
Boy (2): Yes.
Prabhupāda: Who says yes? Please come here. Thank you. It is very good. At least one of you know what is Bhagavad-gītā. Don't go away. Please come here. In the Bhagavad-gītā it is said that kṣetra-kṣetra-jñaḥ (BG 13.3). Two things are described there. Kṣetra means this body, and kṣetra-jña means the knower of the body. Just like "I am." I know this is my finger, this is my leg, this is my head. So I am the knower. And this leg is my body. Is that . . . is it not stated in the Bhagavad-gītā?
Boy (2): Well, I don't know the Bhagavad-gītā very well.
Prabhupāda: All right. Bhagavad-gītā, in the Thirteenth Chapter, you will find it is described: the body and the knower of the body. Just like you think over your body, you think over your finger, you will understand that it is your finger. When I think of this finger, I know this is my finger. When I think of this leg, I think that, "This is my leg." But I don't think your finger as my finger. This knower is individual, and he knows not everything but something of his body.
I do not know everything of my body. Suppose I am eating, I am eating something. How this eatable substance transforms into vitamin secretion and how it is being distributed all over the body and is supplying the energy? Or take, for example, I have got my hair, but I do not know how many hairs I have got. Is not that a fact? Can you count your hairs, how many hairs you have got? So, so many things we do not know even of our body, although I am claiming that "This is my body."
But there is another living being. He is supreme living being, Kṛṣṇa. He says that, "I know everything of everyone's body."