enjoyer, as the foremost person, the Supreme Personality of Godhead, never born, and greatest. Now, one may say that, since Krsna and Arjuna were friends, Arjuna was only saying these things to his friend. But Arjuna mentions that Krsna is accepted as the Supreme Personality of Godhead not only by himself but by Narada, Vyasa, and numerous other great persons.
Therefore, Arjuna says, “Whatever You have spoken to me, I accept as perfect. Your personality is very difficult to understand. You cannot be known even by the demigods.” This means that even persons greater than human beings cannot know Krsna. How, then, can a human being know Krsna, unless he is a devotee?
In studying  Bhagavad-gita , one should not think that he is the equal of Krsna. Krsna is the Supreme Personality of Godhead. One who wants to understand  Bhagavad-gita  should accept Krsna as the Supreme Personality of Godhead. Otherwise it is very hard to understand, and it becomes a great mystery.
This  Bhagavad-gita  is meant for delivering persons from the nescience of this material entanglement. Everyone is in difficulty, just as Arjuna was on the Battlefield of  Kuruksetra . Not only Arjuna, but each of us is full of anxieties because of this material entanglement. Our existence is eternal, but somehow we are put into this position which is  asat .  Asat  means unreal.
Unless one is inquiring as to why he is suffering, he is not a perfect human being. Humanity begins when this inquiry is awakened in the mind. Every activity of the human being is said to be a failure unless this inquiry is present. One should ask, “Where am I from? Where am I going? Why am I here?” When these inquiries are awakened in the mind of a sane human being, then he can understand Bhagavad-gita. He must also have respect for the Supreme Personality of Godhead. Krsna comes here just to establish the real work of life, which man forgets. Out of many, many human beings, the  Bhagavad-gita  is directed to the one who seeks to understand his position. The Lord has great mercy for human beings. Therefore, He spoke the  Bhagavad-gita  to Arjuna to enlighten him. Arjuna was actually above all such ignorance, but he was put into ignorance on the Battlefield of  Kuruksetra  just to ask what life was all about, so that our mission of human life could be perfected.
It is the preliminary study of the science of God which is explained here. The first question is: What is the cause? Next: What is the constitutional position of the living entities in respect to the controller? Living entities are not controllers. If I say,