So this is the problem, duty. Arjuna was forgetting duty. And Kṛṣṇa was inducing him: "Never mind. According to kṣatriya rules and regulation, even the opposite party is your own son, you should not hesitate to kill him. This is kṣatriya's business." If the opposite party is your own son, but when there is fight, there must be decided: one party must be killed. This is kṣatriya's business.
So he says, gurūn ahatvā hi mahānubhāvān (BG 2.5). "These guru, this Droṇācārya and Bhīṣma, they are not ordinary men." Mahānubhāvān. Bhīṣma, everyone knows. Bhīṣma is one of the authorities, authorities of religious principle. There are twelve authorities.
- svayambhūr nāradaḥ śambhuḥ
- kumāraḥ kapilo manuḥ
- prahlādo janako bhīṣmo
- balir vaiyāsakir vayam
- (SB 6.3.20)
There are four . . . twelve authorities. One of them is Bhīṣma. Prahlādo janako bhīṣmo balir vaiyāsakir vayam.
So Bhīṣma is not ordinary person.