The Way of Chanting and Knowing Krşna  
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janma karma ca me divyam evam yo vetti tattvataḥ tyaktvā deham punar janma naiti mām eti so ’rjuna
“One who knows the transcendental nature of My appearance and activities does not, upon leaving the body, take his birth again in this material world, but attains My eternal abode, O Arjuna.” (Bg. 4.9)
The mission for which Kṛṣṇa appears is here further explained. When He comes with some mission, there are some activities. Of course there are some philosophers who do not believe that God comes as an incarnation. They say, “Why should God come to this rotten world?” But from  Bhagavad-gītā  we understand otherwise. We should always remember that we read  Bhagavad-gītā  as scripture, and whatever is spoken in  Bhagavad-gītā  must be accepted, otherwise there is no reason in reading it. In  Gītā  Kṛṣṇa says that He has come as an incarnation with a mission, and along with His mission there are some activities. We can see, for example, that Kṛṣṇa is active as chariot-driver for Arjuna and engages in so many activities on the battlefield of Kurukṣetra. Just as when there is war one person or nation may side with another person or nation and show partiality, Lord Kṛṣṇa on the battlefield shows some partiality and sides with Arjuna. Actually Kṛṣṇa is not partial to anyone, but externally it appears that He is partial. This partiality, however, should not be accepted in the ordinary sense.