So knowledge means without any mistake. Anything without any mistake, that is perpetually right. And anything based on mistaken idea, that will change. You have to correct the mistake. The so-called modern scientist, they are simply correcting their mistake. Therefore they have no real knowledge. Nobody can have real knowledge, because we are imperfect. Our senses are imperfect. That is our defect in the conditioned life. We have got four defects: we commit mistake, we become illusioned, our senses are imperfect and we cheat. Because our knowledge is imperfect, still, we take the position of teacher; therefore we are cheater—not teacher, but cheater. So the teacher society nowadays is the cheater society. And this modern world is a society of the cheater and the cheated. That's all. Somebody is cheating and somebody is being cheated. This is going on.
So how we can be not cheated? That is mahātmabhiḥ. You have to follow the previous great ācāryas, mahātmabhiḥ. Just like Kṛṣṇa is accepted. Kṛṣṇa says He is the Supreme Personality of Godhead. Arjuna accepted, "Yes, paraṁ brahma paraṁ dhāma (BG 10.12)," after hearing from Him. Paraṁ brahma. And then, after Arjuna, disciplic succession. Lord Caitanya accepted. All the ācāryas, Rāmānujācārya, Madhvācārya, accepted Kṛṣṇa the Supreme Personality. Śāstra says, kṛṣṇas tu bhagavān svayam (SB 1.3.28). So we have to follow these mahājana. Otherwise we cannot get the right knowledge. Mahājano yena gataḥ sa panthāḥ (CC Madhya 17.186). We have to follow great authorities. So who are authorities? They are mentioned in the śāstras:
- svayambhūr nāradaḥ śambhuḥ
- kumāraḥ kapilo manuḥ
- prahlādo janako bhīṣmo
- balir vaiyāsakir vayam
- (SB 6.3.20)
Everything is there, śāstra. So Yudhiṣṭhira Mahārāja followed the principles as it was done by the previous mahātmabhiḥ, great personalities, not only in his family but also otherwise. Because knowledge is . . . right knowledge is not different. "Two plus two equal to four," it is right in Europe, in America, in Asia, in white, in black—everywhere. It is truth, "Two plus two . . ." You cannot make "Two plus two equal to five." That is not possible. That is truth.