So here, a brahma-bandhu... Aśvatthāmā was born of a brāhmaṇa, Droṇācārya. But he killed the five sons of Draupadī most abominably, when they were sleeping. So what to speak of brāhmaṇa, he's less than a kṣatriya even. Because a kṣatriya also do not kill anybody while one is sleeping. A kṣatriya challenges, offers him weapon, fights, and then one of them is killed. That is... So here it is brahma-bandhoḥ ātatāyinaḥ (SB 1.7.16). Ātatāyinaḥ, aggressor. Anyone who kidnaps one's wife is called aggressor. One who sets fire in your house, he's aggressor. One who is coming to kill you with weapon, he's aggressor. In this way there is a list of aggression. So aggressor can be killed immediately. If somebody is aggressor, there is no sin in killing aggressor. Enemy who sets fire to the house, administers poison, attacks all of a sudden with deadly weapon, plunders wealth, or usurps agricultural field, or entices one's wife is called an aggressor. Everything... This is Vedic knowledge. Everything has got definition.
So this Aśvatthāmā was an aggressor. Therefore Arjuna decided to kill him. He is, although he's born in a brāhmaṇa family... Naturally a person born in a brāhmaṇa family is expected to become a brāhmaṇa by qualification. That was the training. The brahmacārī... Generally the sons of brāhmaṇa and kṣatriyas especially, these two sects, up to vaiśya, they were trained up as brahmacārīs. And śūdras were not interested. The door is open for everyone, but the lower class, except brāhmaṇa, kṣatriya, they are not interested to become brahmacārī or their parents are not interested. Just like we are going to open this brahmacārī school, or āśrama, but I am doubtful whether we'll get many children. Because in this age people are interested to become śūdras. Nobody is interested to become brāhmaṇa. Technology. Technology means śūdra. Technology is not the business of a brāhmaṇa, kṣatriya, or vaiśya. No. Just like blacksmith, goldsmith, carpenter, craftsman. These are technology. They are meant for the śūdras. Brāhmaṇas, they are to be trained up how to become truthful, how to become controller of the senses, how to become simple, how to become tolerant. In this way. Kṣatriya—how to become strong, stout, brave, no going away when there is challenge, not to go away from fighting, to possess land, to rule over, īśvara-bhāvaś ca (BG 18.43), and charity. These are the kṣatriya qualifications. The charity was given by the kṣatriyas. Even there are instances that Muhammadan rulers in this country, they also gave in charity land and temple in Vṛndāvana. There are many instances. Aurangzeb gave some land, Jahangir gave some land. There is still one temple, it was constructed by Jahangir, and the other side of the Yamunā there is a village called Jahangir-pura. That village was given to the brāhmaṇas for maintaining the temple. So charity, that is kṣatriya's business, and perform yajñas, give in charity, to rule, not to go away from fighting, challenge, very strong, stout—these are kṣatriya qualification. And the vaiśya qualification—agriculture. Kṛṣi. Kṛṣi-gorakṣya, and cow protection. Kṛṣi-gorakṣya-vāṇijyam. And if there is excess, then vāṇijya, trade. Otherwise there is no question of trade. And vaiśya... And śūdra, paricaryātmakam (BG 18.44)—to work for some payment. That is this blacksmith, goldsmith, weaver. You take some work from him and pay him something, maintain him. That is śūdra. So in the śāstra it is said, kalau śūdra-sambhavaḥ. In the Kali-yuga almost everyone is a śūdra. You'll find they're interested in accepting some service. Even one is born of a brāhmaṇa family, he is looking after some good job. That is śūdra mentality. That is not brāhmaṇa's business. Brāhmaṇa will not accept anyone's service, neither the kṣatriyas, neither the vaiśyas. Only śūdras.