Vishnujana, Seattle, October 14, 1968: “For the soul there is never birth nor death. Nor, having once been, does he ever cease to be. He is unborn, eternal, ever-existing, undying and primeval. He is not slain when the body is slain.” (Bhagavad-gita 2.20)
Prabhupada: These are the statements of Krishna. Now the constitution of the soul… So far materialists are concerned, they cannot even find out where is the soul. Therefore there are so many theories. Actually, they cannot find out where the soul is situated because material senses cannot approach.
The measurement of the soul is stated in the Vedic literature as one ten-thousandth part of the tip of the hair. So there is no possibility of understanding what is soul by material scientists. The only process is to take it from higher authorities like Krishna. Krishna here gives definition of the soul.
So we have to accept it. And not blindly accept it, but try to understand as far as possible with your arguments and reason, but this is the actual fact. What is that statement? The soul, definition of soul, Krishna is giving?
Vishnujana: “Only the material body of the indestructible, immeasurable and eternal living entity is subject to destruction. He who thinks that the living entity is the slayer or that the entity is slain does not understand. One who is in knowledge knows that the self slays not nor is slain.”
Prabhupada: Then next?
Vishnujana: 20: “For the soul there is never birth nor death. Nor, having once been, does he ever cease to be. He is unborn, eternal, ever-existing, undying and primeval. He is not slain when the body is slain.”
Prabhupada: Yes. Because eternal, therefore how it can be slain? So soul is never slain. The body is slain. Then?
Vishnujana: 21: “O Partha, how can a person who knows that the soul is indestructible, unborn, eternal and immutable kill anyone or cause anyone to kill?” Full Lecture