One should be intelligent enough to understand or to hear katha of Krsna. Simply you have to do this.

Just like you are all sitting here; it doesn't require that you have to pass M.A. examination, Ph.D. examination. God has given you the ear. Simply you sit down and hear from a realized person. The words are there, the message are there. Just like Srimad-Bhagavatam, Bhagavad-gita, especially. Everything is there to understand about God. Simply you have to increase your attachment for hearing. That is, that qualification required. Not that first of all you pass M.A. examination, then you come here and you can understand. No. Simply by hearing, hearing, hearing, you will become expert. Kovida. Simply.

From Srila Prabhupada's lecture on Srimad-Bhagavatam 1.2.15 — August 18, 1972, Los Angeles