You are driving car, running with seventy miles speed.. it is smashed accidently. But you are alive then you have to change your car. Similarly, we can drive this machine called the body for so many years; then it becomes old and we have to change it for another machine. This is the process of birth and death.
We stop taking birth when we understand Krishna's birth.
Lecture on "Understanding Krishna through Bhagavad Gita" – Salem – 8th Nov'06
In every birth one gets a father and a mother but one may not get instructions for his ultimate benefit.