So here, Aśvatthāmā, he's born of a brāhmaṇa father, but his work has been proved just like a butcher. Therefore he is called brahma-bandhu. He's called not a brāhmaṇa: brahma-bandhu. Brahma-bandhoḥ śira ātatāyinaḥ. Ātatāyinaḥ, aggressor. A brāhmaṇa does not require to kill a person with weapon. No. That is kṣatriya's business. If one is actually a brāhmaṇa—of course, in the Kali-yuga such brāhmaṇa is not to be found—his simply curse is sufficient to kill a man. If a brāhmaṇa curses somebody... Just like Mahārāja Parīkṣit, he was cursed by a brāhmaṇa's son. Means not fully brāhmaṇa, not grown-up. A child, a boy twelve years old, he cursed Parīkṣit Mahārāja that "Within seven days you'll be bitten by a serpent," and it came to be true. So brāhmaṇa does not require any sword or any arrow to kill a man. His very word is sufficient. Therefore when somebody was to be killed, the brāhmaṇa would bring him to the kṣatriya—not killing himself by weapon. Just like Viśvāmitra, he wanted to kill one rākṣasī, so he came to Mahārāja Daśaratha, kṣatriya, to do the business of killing. There are so many... That is shastric evidences.
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. 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.