Gita was narrated by Krishna to Arjuna who was skilled and noble and when he became the despondent in the battlefield of Kurukshetra. It was given at a time when he could not withstand the challenge to fight his own relatives, teachers and friends. The message revived Arjuna who then went on to fight as a true Karma Yogi would.
Gita is all about “Tat Tvam Asi” – meaning “You are That”
“Tvam” is you as an individual who is overwhelmed by challenges faced. It explains us as individuals our duty, Karma or path of action. When an individual functions or does his Karma without expectation of the fruits, his worldly desires wane away and he enters meditative state where he starts to understand “Self”.
“Tat” means supreme reality , the eternal force. In Bhagvad, Krishna demonstrates that reality or God is in everything – the good, bad and in the ugly.
“Asi” talks about relationship between the individual i.e. Tvam and the eternal, i.e. “Tat”. Like any family tree where parent is shown on top and descendants below, world is made up of three gun as (behaviours) – tamas which is ignorance, rajas which reflects activity and sattva which reflects balance or composure.
When one goes beyond the gunas one finds one’s true self.
Gita ends with Arjuna overcoming his state of mind and he gets ready to do his duty and fight a righteous war.
So the morale we as individuals need to take is do our Karma with a vision that everything that we do has an element of the eternal force, which continually bestows on us success and prosperity.