Why these four kinds of animals have been selected to compare? That is explained. Śva means dog. A dog, however powerful it may be, very strong, stout, but it, unless it has got a master, its life is very precarious. Dog. Just see our education at the present moment, very advanced education. Many Indian students come here also to take advanced education. But actually, if we consider, this education creating dogs. Why? Now, because however technologist you may be, if you don't get a suitable service, all your education is finished.
Therefore, after education you'll have to write application, "My dear sir, I am such-and-such qualified dog. (laughter) If you'll kindly give me some service." And the tail is like this. (laughter) You see? Just imagine. If by education he becomes independent . . . just like Vedic culture. The Brāhmins, the Kṣatriya, the Vaiśyas, they are independent. The Śūdras are compared with the dogs, because they cannot live without a master. Brāhmin, he will not accept anyone's service. That is real Brāhmin. A Kṣatriya will never accept anyone's service.
Why the Battle of Kurukṣetra was there? The Kurus, they took away the whole kingdom of the Pāṇḍavas. But they were Kṣatriyas; how they will live? Therefore the fight was necessity. The Kṣatriyas must be . . . must have some land to collect taxes. That is the Kṣatriyas source of income. The Brāhmins source of income, paṭhana pāṭhana yajana yājana . . . they must be learned scholar, they must teach others, they must be devotee and teach others how to become devotee. They must take contribution and must spend for Kṛṣṇa. This is Brāhmin. No service.
Formerly, no Brāhmin . . . Sanātana Gosvāmī, Rūpa Gosvāmī, they were born in high-class Brāhmin family, Sārasvata Brāhmin, but because they accepted the service of Nawab Hussain Shah, immediately they were rejected from Brāhmin society. It is by the grace of Caitanya Mahāprabhu that they again became Gosvāmīs. Otherwise, they were rejected. No Brāhmin could take service, and especially service of a low-class man. That is . . . in Bhāgavata you will see especially that if a Brāhmin is in difficulty, he may accept the profession of a Kṣatriya or utmost of a Vaiśya, but never take the profession of a Śūdra.