Tamāla Kṛṣṇa: Thirty-four: "Attraction and repulsion for sense objects are felt by embodied beings, but one should not fall under the control of senses and sense objects, because they are stumbling blocks on the path of self-realization."
Thirty-five: "It is far better to discharge one's own prescribed duties, even though they may be faulty, than another's duties. Destruction in the course of performing one's own duty is better than engaging in another's duty, for to follow another's path is dangerous."
Thirty-six: "Arjuna said: O descendant of Vṛṣṇi, by what is one impelled to sinful acts, even unwillingly, as if engaged by force?"
Prabhupāda: Here Kṛṣṇa says that, "Destruction in the course of performing one's own duty is better than engaging in another's duties, for to follow another's path is dangerous." Now, Arjuna was a military man, a kṣatriya. His business was to fight for the good cause. But in the battlefield he thought that, "Why should I engage myself in this killing business? Better retire from it. If I don't get my kingdom, I shall rather beg."
This begging business is for us. Just like we are sannyāsī or a Brāhmiṇ; we are allowed to beg. We are not, of course, begging as professional beggar, but we introduce ourself as beggar. The Vedic culture is that a sannyāsī, when he comes to beg in a householder's house, he receives him very respectfully, and whatever he wants, they want to supply. But they do not want anything, but the introduction is that they take this opportunity of sitting in a householder's home and talk about Kṛṣṇa consciousness. That is their real business. They are not beggars.
Anyway, this begging business is not for a householder or a military man. Therefore Kṛṣṇa says that, "Don't try to imitate the business of a sannyāsī or a Brāhmiṇ. You are kṣatriya. You . . . your duty is to fight, so you should follow your own prescribed duty. Don't try to imitate others." But one can attain perfection by being engaged in his own occupation, provided he does it in Kṛṣṇa consciousness. So Kṛṣṇa is asking him to fight, and he is a professional fighter. So if he fights in accordance with the order of Kṛṣṇa, there is his perfection. This is the purport.