Bhagavad Gita, the sermon delivered by Lord Krishna to Arjuna in the battle of Mahabharata is one without a single flaw! The teachings of Lord Krishna in Bhagavad Gita, the entire 700 shlokas verses contained truth but only truth. Not even a single line or word could ever be belied.
There was nothing more truthful in entire world than teachings of Lord Krishna in Bhagavad Gita. Prime reason why oath in all Indian courts is taken on Bhagavad Gita!
Bhagavad Gita is a spiritual treatise that shows human beings path to reaching god. As per Bhagavad Gita we are primarily a spiritual traveler, a cosmic traveler on its cosmic sojourn and not a manifest human being.
As a soul we could not purify self of our own and hence need a medium, a body to work out our karma. Human form being the highest manifest stage in cosmic life cycle it is only in human form a soul atman could liberate self from cycle of birth and death, reach state of absolute purity.
Indulging in teachings of Bhagavad Gita when human beings finally reached state of enlightenment followed by moksha salvation it announced end of cosmic journey for soul atman.
A scripture like Bhagavad Gita that stood on the highest pedestal of spirituality, how could it ever contain a single flaw?