Lord Krishna reveals the divine origin of the Gita teachings, explaining that he has imparted this wisdom over ages to protect and guide humanity. He describes his incarnations on Earth, which happen whenever righteousness declines, to restore balance. Krishna explains that actions performed with spiritual knowledge and without selfish desires lead to liberation. He encourages Arjuna to understand the nature of true knowledge, which helps transcend the bondage of karma. By combining wisdom with selfless action, one can achieve purity of mind and unity with the divine.