Why one is born in lower grade family? Why one is born in high-grade family? Karanam guna-sango 'sya. The cause is as he has associated with different types of qualities. So unfortunately, this science, that there is birth after death, and there is, actually, we are experience, we are seeing, but they do not inquire. They think that one can improve. That is not possible. Unless he changes the quality, he cannot improve. That is not possible. They do not know it. They are falsely trying to improve the position. Nobody is trying to become poor. Everyone is trying to become rich. But it is not possible. Because he has got a particular type of body, and that body is already destined, and he has to achieve happiness or suffer distresses according to the body.
Lecture on Bhagavad-gita 13.22, Bombay, 20 October, 1973