God in our subconscious. The eternal is liberation.The purpose of human life is to aware and not become ignorant.

There is again the description of the timeline in brahma and also how the big-bang happened .

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.