Krishna here is talking about the " Ideal Man" or " Perfect Man'. One can find the literal translation of this shloka anywhere. Krishna again talks about this Ideal man, after the war is over. During the period of Yayati, the same discussion takes place in his court. Of course Baharata is much more later than the period of Yayati (Yayati is ancestor of pandavas.). The spark of this " maha muni" was lit ages ago. But somehow no one was ever able to define it. The first time, definition was given by an unknown sage in the courts of Yayati. Later, Krishna tells Arjuna, the qualities of Maha Muni . This ideal man never feels sad, there is no attachment to anyone or anything, there is no anger, there is no fear, there is no sadness, there is no feeling of sulkiness. This man is also called as "Sthitha Pragnya ". A man whose consciousness is stable and never weavers. The stability of the mind cannot be moved by emotions of self or is influenced by other people, it doesn't even weaver with the power. Surprisingly, the discussion is never seen in any other chapters off Gita. After the war, there is a mention of this Ideal man. And that is when Krishna realizes that the " yadava" clan is going to get eliminated. He is so hurt to know that his clan will fight for power, the clan that he thought were meant for peace. The family feud bothers him a lot but he knows that this is what is destined to be. He doesn't help is clan, doesn't shed a tear, finishes his job on earth, and completes his avatar. He never says in whole of Bharata that he is the ideal man, but one achieves that ideal state and not born to that.