Arjuna fires a volley of questions: what is the eternal, the self, action? What stands behind the elements, behind the gods? How do the self-ruled know you at the hour of death? Krishna answers each one crisply — brahman is the imperishable highest, the self is its presence in each being, action is the creative surge that births all beings — and then turns to the matter that haunts every living person: dying. Whatever fills your mind at the moment of leaving, to that you go, shaped by a lifetime of dwelling there. So remember me at all times, and fight. A mind trained to return, wandering nowhere else, reaches the supreme radiant person. The practice is not complicated: sound Om, the one syllable of the eternal, and remember me as you leave the body. For the one who remembers daily, constantly, thinking of nothing else, Krishna is easy to reach. Then the teaching widens to cosmic scale. The Creator's day lasts a thousand ages, his night a thousand more. When the day dawns, all forms pour out of the formless. When night falls, they dissolve back. Again and again the host of beings rises and falls, helpless. But beyond this cycle stands something that does not perish when all beings perish — Krishna's highest home, reached by undivided love alone. The chapter names two roads out of the body — one bright, one dark — and says the yogi who knows both is never confused. The practical teaching underneath the cosmology is simpler than it sounds: whatever you practice daily becomes what you are. The last thought at death is not a lucky draw. It is the sum of every ordinary moment you chose to remember or chose to forget.