Our real problem is that we are accepting a material body, and after some days, we are giving up the present material body, and we are accepting another material body. How we are accepting different bodies? That you have got experience. Just like you, I, both of us had a small child's body. That is now gone. The boy's body is now gone. The youthful body is now gone. Now I have got a different body. But I know that I had such-and-such body. Similarly, when this body will be useless, I cannot use it, I will have to accept another body. That we have got experience daily, in day and night. When we sleep at night, although we have got this body lying on my bed, I accept another body, subtle body, and I go to another place and dream. Similarly, at night, when I give up that subtle body which took me far away from my bed, again I come and accept this material body and wake up.
Death means to leave this body and carried by the subtle body to another gross body. That is called death. We are carried by the mind, intelligence and ego, subtle body. Just like we can experience a good scent of rose flower is carried by the air—we cannot see, but we know that the flavor is being carried by the air—similarly, although we do not see how the spirit soul is being carried by the subtle body, but it is being carried, and it is being put into the womb of another mother to develop another gross body. So this body is offered by nature. This body is given by the material nature. Similarly, we, or I, the spirit soul, being carried by the subtle body, and the nature is giving me another gross body. In this way we are transmigrating from one body to another. This is called evolution. And there are 8,400,000's of bodies, and we are going through one after another.
So this human form of body is the only chance that we can stop this transmigration of transferring ourself from one body to another and come to our spiritual body. This process is described here as pūtā, purification, existentional purification. That is called pūtā. Just like when you are infected by some disease, you have to purify yourself after the infection and you come to your normal health, similarly, by knowledge and purificatory method, if you come to your spiritual knowledge and spiritual platform, then your life is successful.