So less intelligent class of men, they cannot understand Kṛṣṇa. Therefore śāstra says, ataḥ śrī-kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ (CC Madhya 17.136). These indriya, these material senses, cannot speculate to understand the Supreme Personality of Godhead. That is not possible. Śrama eva hi kevalam (SB 1.2.8). That is simply laboring, wasting time. Kṛṣṇa should be understood as Kṛṣṇa says. He can explain Himself. Nobody can explain. Because our senses are imperfect. We are deficient by four kinds of faults. We commit mistake; we are illusioned; with imperfect senses, we try to speak transcendental knowledge; therefore cheating. With imper... They will say, "Probably," "Maybe." This is the so-called scientists' language. That means imperfect knowledge. Still, they want to teach. This is cheating. Knowledge must be perfect. Then you can teach others.