Prabhupāda: Kṛṣṇa consciousness is there in the Bhagavad-gītā. It is a very popular and old literature, Vedic literature, known all over the world. But so far the history of this Bhagavad-gītā is concerned, there are difference of opinions, but factually even if we take it as it is, it is at least five thousand years old. And in the Bhagavad-gītā we learn that five thousand years ago it was spoken on the battlefield of Kurukṣetra. But before that, some millions of years ago, the same Bhagavad-gītā was spoken long, long ago. So actually the human effort cannot trace out the history of Kṛṣṇa consciousness, but taking consideration of the present history, it is at least as old as five thousand years.