Why go-rakṣya? Why not other animal rakṣya? Kṛṣṇa has not said "animal rakṣya" or "janawal-(?) rakṣya." Go-rakṣya. The cow is very, very important animal. If you want to advance your spiritual consciousness, then you must have sufficient milk and sufficient grains. That is civilization. Therefore it is the duty of the vaiśyas to produce food grain. Annād bhavanti bhūtāni (BG 3.14). Annād. In the society, if you have got sufficient anna, both the animals and the man, they will be happy. These are the instruction in the Bhagavad-gītā, everything practical. If we follow Bhagavad-gītā from all angles of vision—social, political, economical, religious, cultural—you will be perfect. This is Bhagavad-gītā. We are therefore taken up this mission, to preach Bhagavad-gītā as it is to solve all the problems of the world. That is Aryan civilization. Aryan civilization means following the principles of Bhagavad-gītā.
So here Kṛṣṇa is addressing Arjuna, anārya: "Non-Aryan. You are kṣatriya. Your service is now required to fight with persons who have created injustice. So what is this, that you are denying to fight?" Anārya juṣṭam. And asvargyam. Asvargyam means "By denying your duty you cannot be elevated in your next life or you cannot be elevated in the higher planetary system." For a kṣatriya, it is the duty of the kṣatriya to fight and lay down his life. Then he is promoted to the higher planetary system.