The process of devotion is nine different types. Śravaṇam. Śravaṇam means hearing. Kīrtanam. Kīrtanam means chanting. Kīrtanam actually means describing. You can describe with music. You can describe with words. You can describe in speeches. Any sort of describing, that is called kīrtana. And śravaṇam. Unless you hear, you cannot describe. What you shall describe? If you do not know anything about the Supreme Lord, then how can you describe?
Therefore hearing is the first item, śravaṇam. And the whole Vedic literature is called hearing, śruti, śruti-śāstra. Śruti means to receive hearing. If you want to know the Supreme, you do not require to qualify yourself materially. You can remain what you are, but if you simply hear . . . God has given you the power of hearing. If you hear from authoritative sources, then you become perfect, simply by hearing. Therefore the first principle, hearing, is recommended, śravaṇam.
And formerly, the Vedas were heard by the students from the spiritual master. Just like in the Bhagavad-gītā you'll find that Arjuna is hearing from Kṛṣṇa. He's not studying any Vedānta philosophy in the battlefield. He was simply hearing. So that is the process, hearing. You can hear at any place. Even in the warfield, you can hear from the authoritative source. So that was the process of acquiring knowledge, hearing.
Hearing means receiving the knowledge, not manufacturing. There are two process of knowledge. There are some persons who think, "Oh, why shall I hear from him? Oh, I can think. I can speculate. I can manufacture something new of my own group." These are nonsense. This is not Vedic process. Vedic process is hearing, ascending process, er, not . . . descending process. There are two processes of knowledge: ascending and descending. Ascending means trying to go high by your strength, and descending means the pure knowledge which comes from up, you receive it. Inductive and deductive process.