Acharya Prashant explains the concept of 'Mamattva Buddhirahit' from the Bhagavad Gita, which refers to a state of intellect free from the sense of 'mine' or personal ownership. A Karma Yogi does not perform actions based on personal attachment or the distinction of what belongs to them versus others. Instead, their sole focus and goal is Shri Krishna. By abandoning the feeling of 'mine', the practitioner ensures that their intellect is not clouded by worldly attachments, allowing them to work for the purification of the inner self.