So for such spiritual knowledge we have to accept the authority. Now, here, the Bhagavad-gītā is authority. It is accepted. Don't think that it is a scripture of the Hindus. No. It is for all human beings. There is reason. There is science. There is philosophy. It is not dogmatic. So it is to be understood simply. And not only that, actually it is accepted by all countries. Not only in your country, but in other countries also, Bhagavad-gītā is accepted as one of the greatest book of authority. So this is the process. You should know it that the spirit soul, as it is stated in the Bhagavad-gītā,
- dehino 'smin yathā dehe
- kaumāraṁ yauvanaṁ jarā
- tathā dehāntara-prāptir
- dhīras tatra na muhyati
- (BG 2.13)
As the soul is within the body and the body is changing every moment, similarly, the last stage of change is called death. Death is nothing but the final change of this present body. That's all.