Introduction
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given by Lord Kṛṣṇa Himself in  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 disciplinary succession. Similarly, in  Śrīmad-Bhāgavatam  Kṛṣṇa imparted knowledge into the heart of Brahmā, the first created creature 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 comes down to Mādhavendra Purī, to Iśvara 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 disciplinary succession. The knowledge of that disciplinary 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 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.
In  Śrīmad-Bhāgavatam  there is a great deal of information given about the Vaikuṇṭha planetary systems which are beyond the material universe. Similarly, a great deal of inconceivable information is given in  Caitanya-caritāmṛta . Any attempt to arrive at this information through experimental knowledge is not possible. The knowledge simply has to be accepted. According to the Vedic method,  śabda , or transcendental sound, is regarded as evidence. Sound is very important in Vedic understanding, for, if it is pure, it is accepted as authoritative. Even in the material world we accept a great deal of information which is sent thousands of miles by