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 Krsna Himself in the Bhagavad-gita, where Krsna tells Arjuna at the beginning of the Fourth Chapter:
- imam vivasvate yogam proktavan aham avyayam
- vivasvan manave praha manur iksvakave 'bravit
"I instructed this imperishable science of yoga to the sun-god, Vivasvan, and Vivasvan instructed it to Manu, the father of mankind, and Manu in turn instructed it to Iksvaku." (BG 4.1) This is the method of parampara, or disciplic succession. Similarly, Srimad-Bhagavatam explains that Krsna imparted knowledge into the heart of Brahma, the first created being within the universe. Brahma imparted those lessons to his disciple Narada, and Narada imparted that knowledge to his disciple Vyasadeva. Vyasadeva imparted it to Madhvacarya, and from Madhvacarya the knowledge came down to Madhavendra Puri and then to Isvara Puri, and from him to Caitanya Mahaprabhu.