It is not possible to imagine how far this material manifestation extends. In the material world everything is calculated by imagination or by some imperfect method, but the Vedic literatures give real information of what lies beyond the material universe. Since it is not possible to obtain information of anything beyond this material nature by experimental means, those who believe only in experimental knowledge may doubt the Vedic conclusions, for such people cannot even calculate how far this universe extends, nor can they reach far into the universe itself. That which is beyond our power of conception is called acintya, inconceivable. It is useless to argue or speculate about the inconceivable. If something is truly inconceivable, it is not subject to speculation or experimentation. Our energy is limited, and our sense perception is limited; therefore we must rely on the Vedic conclusions regarding that subject matter which is inconceivable. Knowledge of the superior nature must simply be accepted without argument. How is it possible to argue about something to which we have no access? The method for understanding transcendental subject matter is given by Lord Kṛṣṇa Himself in the Bhagavad-gītā, where Kṛṣṇa tells Arjuna at the beginning of the Fourth Chapter:
- imaṁ vivasvate yogaṁ proktavān aham avyayam
- vivasvān manave prāha manur ikṣvākave ’bravīt
“I instructed this imperishable science of yoga to the sun-god, Vivasvān, and Vivasvān instructed it to Manu, the father of mankind, and Manu in turn instructed it to Ikṣvāku.” (BG 4.1) This is the method of paramparā, or disciplic succession. Similarly, Śrīmad-Bhāgavatam explains that Kṛṣṇa imparted knowledge into the heart of Brahmā, the first created being within the universe. Brahmā imparted those lessons to his disciple Nārada, and Nārada imparted that knowledge to his disciple Vyāsadeva. Vyāsadeva imparted it to Madhvācārya, and from Madhvācārya the knowledge came down to Mādhavendra Purī and then to Īśvara Purī, and from him to Caitanya Mahāprabhu.
One may ask that if Caitanya Mahāprabhu is Kṛṣṇa Himself, then why did He need a spiritual master? Of course He did not need a spiritual master, but because He was playing the role of ācārya (one who teaches by example), He accepted a spiritual master. Even Kṛṣṇa Himself accepted a spiritual master, for that is the system. In this way the Lord sets the example for men. We should not think, however, that the Lord takes a spiritual master because He is in want of knowledge. He is simply stressing the importance of accepting the disciplic succession. The knowledge of that disciplic succession actually comes from the Lord Himself, and if the knowledge descends unbroken, it is perfect. Although we may not be in touch with the original personality who first imparted the knowledge, we may receive the same knowledge through this process of transmission. In Śrīmad-Bhāgavatam it is stated that Kṛṣṇa, the Absolute Truth, the Personality of Godhead, transmitted transcendental knowledge into the heart of Brahmā. This, then, is one way knowledge is received—through the heart. Thus there are two processes by which one may receive knowledge: One depends directly upon the Supreme Personality of Godhead, who is situated as the Supersoul within the heart of all living entities, and the other depends upon the guru, or spiritual master, who is an expansion of Kṛṣṇa. Thus Kṛṣṇa transmits information both from within and from without. We simply have to receive it. If knowledge is received in this way, it doesn’t matter whether it is inconceivable or not.