There are many examples given of how we are to utilize those things which are set aside for us by the Lord. This is also explained in Bhagavad-gītā. In the beginning, Arjuna decided that he should not fight in the Battle of Kurukṣetra. This was his own decision. Arjuna told the Lord that it was not possible for him to enjoy the kingdom after killing his own kinsmen. This decision was based on the body because he was thinking that the body was himself and that his bodily relations or expansions were his brothers, nephews, brothers-in-law, grandfathers and so on. Therefore he wanted to satisfy his bodily demands. Bhagavad-gītā was spoken by the Lord just to change this view, and at the end Arjuna decides to fight under the directions of the Lord when he says, kariṣye vacanaṁ tava (BG 18.73): "I shall act according to Your word."
In this world men are not meant for quarreling like cats and dogs. Men must be intelligent to realize the importance of human life and refuse to act like ordinary animals. A human being should realize the aim of his life, and this direction is given in all Vedic literatures, and the essence is given in Bhagavad-gītā. Vedic literature is meant for human beings, not for animals. Animals can kill other living animals, and there is no question of sin on their part, but if a man kills an animal for the satisfaction of his uncontrolled taste, he must be responsible for breaking the laws of nature. In the Bhagavad-gītā it is clearly explained that there are three kinds of activities according to the different modes of nature: the activities of goodness, of passion and of ignorance. Similarly, there are three kinds of eatables also: eatables in goodness, passion and ignorance. All of this is clearly described, and if we properly utilize the instructions of Bhagavad-gītā, then our whole life will become purified, and ultimately we will be able to reach the destination which is beyond this material sky. (BG 15.6)