Prabhupāda: Yes. You take only one grain and mix with water and just inject within your body. So immediately the action is there that your heart fails and you die. One small half grain of pota cyanide, you take, just touch on the tongue. According to the chemist there is no taste of pota cyanide. Because what is this . . . whether it is sour or sweet, because there was no chance of tasting it. As soon as the taste is, (chuckles) the man is finished. He cannot say what is the sour or sweet.
So if a material thing, a small particle, has got so much power that immediately it can stop the function of the body, immediately spreads all over the body, so the soul, the spiritual spark, grain, a small grain, just like atom, it is so powerful that so long is that spiritual grain, spirit is in the heart, this body is so nice.
As soon as it is passed, immediately body begins to decompose. Immediately. So it is so powerful. If a material thing can spread all over the body, why not the spirit? This is consciousness. Because the spirit soul is within the heart, I can pinch any part of my body, I feel that this is consciousness. This is consciousness.
Go on reading. So because . . . just like the effect of a poisonous grain of material thing is immediately felt all over the body, similarly, by the consciousness which is spreading all over the body, you can understand that there is soul.
Devotee: "This verse more clearly explains the real nature of the soul, which is spread all over the body. Anyone can understand what is spread all over the body. It is consciousness. Everyone is conscious about the pains and pleasures of the body in part or as a whole. This spreading of consciousness is limited within one's own body."
Prabhupāda: Now, this consciousness, the Māyāvādī philosopher says: "Yes, I am consciousness," the same theory, this small consciousness, "but as soon as I break this body, the small consciousness will mix up with the supreme consciousness." That is their theory. But anyway, whatever that theory may be, at least in my present condition, I . . . my consciousness, is limited within this body.
I cannot say that I am superconscious. Had I been superconscious, then the pains and pleasure going on in your body I would have felt. But because I am limited within this body, therefore the pains and pleasure of my body I can understand. Therefore my consciousness is limited.