Just as Arjuna accepted  Bhagavad-gita  without any cutting, so we too must accept  Bhagavad-gita  without any cutting, interpretation, or whimsy. We should accept it as perfect knowledge, spoken by the Lord Himself. Only the Lord could have given this infallible knowledge. A living entity would not be able to.
A living being in the mundane world has four defects:
1. He is sure to commit mistakes.  2. He is sure to be illusioned.  3. He has a tendency to cheat.  4. His senses are imperfect.
With these four defects, one cannot offer perfect information. But Vedic knowledge was imparted by God in the heart of Brahma, the first living being in our universe, who passed it down through his sons.
Except for the Lord, no one is the proprietor of anything. The Lord is the original creator. He is the creator of Brahma, the original being in our universe. Therefore, we should accept things given to us by the Lord as our allotment. Arjuna had decided not to fight. He told the Lord that he could not enjoy the kingdom if he killed his relatives to obtain it. This was due to his bodily concept of himself, and thus his relationship with uncles, brothers, nephews, and so forth — all these relationships pertaining to the body. But, finally, Arjuna agreed to work for the Lord's enjoyment. We should not act like ordinary animals. Human life is meant for something else. Vedic literature is meant for human beings, not for animals. An animal can kill without sin because he is bound by the modes of his nature. But, if a man kills, he is responsible. He has a choice in his actions.
In the  Bhagavad-gita  activities are explained as determined by the three modes of nature. Thus, there are actions performed in ignorance, actions performed in passion, and actions performed in goodness. There are also three kinds of eatables: food eaten in ignorance, in passion, and in goodness. These are all clearly described.
Therefore, if we properly follow the instructions in  Bhagavad-gita , our lives will be purified and we will reach our ultimate destination. This destination is also explained in  Bhagavad-gita :
Beyond this material sky there is a spiritual sky. This material sky is temporary, and at the end of this universe it will be annihilated. That is the law of material Nature. But there is another Nature, which is eternal. The soul is eternal just as the Lord is