Bhakti-yoga is transcendental. And because Kṛṣṇa is transcendental, you cannot understand Kṛṣṇa by any material method. Therefore Kṛṣṇa says, bhaktyā mām abhijānāti (BG 18.55). The method also is transcendental, not of this material world. So if we can understand simply these facts, that Kṛṣṇa is transcendental, Kṛṣṇa's name is transcendental, Kṛṣṇa's form is transcendental, sac-cid-ānanda-vigrahaḥ. Īśvaraḥ paramaḥ kṛṣṇaḥ sac-cid-ānanda-vigrahaḥ (Bs. 5.1). Kṛṣṇa's body is sac-cid-ānanda, not body like this. This body is asat, acit and nirānanda, just the opposite. This material body is asat. Asat means temporary. It will not exist. But Kṛṣṇa's body is not like that. Kṛṣṇa's body is eternal. That is cit. Sat-cit. Full of knowledge.
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.