There is a detailed description of the length of time on earth and brahma lok. A comparison is given .The moral is everything which seems to be permanent is actually not. There is end to everything.

Birth and death are not negotiable. One who has taken birth will ultimately die. In this episode God teaches Arjun the scientific technique of how to not take birth again and attain brahmalok.

Shri Krishna says , the Master teaches the disciple about the four great phylisophy such as Tatwamasi, Aham Brahmasmi, Pragyanam brahma and Ayam atma Brahma.

Bhagwan says at the end moment a yogi should put all his or her energy in the ajna chakra and meditate on the Brahma.He gave a scientific elaboration of the process in this shlok.

Shri Krishna says to Arjun, to always remember Him and also face the war.Ultimately you will find me in liberation. Do not be a coward and fight with detatchment.

Shri Krishna says at the last hour when death approaches if a devotee is constantly thinking about God then the soul can reach the God but due to past karmas and desires it is very difficult to think ab out God when death approaches.

The person who thinks of God at the time of death can attain the brahma or attain God himself. But it is quite difficult to do as man is always in fear of death and at the last time he is restless.

There is a detailed description of Adhibhut, Adhidev and Adhiyagyan in this episode. Krishna says all these three elements are Him only.