Pradyumna: If the ear is not engaged in the service of the Lord by hearing about Him in the Bhagavad-gita or in the Srimad Bhagavatam, certainly the holes of the ear will be filled up with some rubbish.

Prabhupada: Yes. This is the secret. We have got the ears, and we have got the sound also. Just like we are reading this book. So if we don't fill up our ears with this transcendental sound, then it will be filled up with some rubbish things. It cannot remain empty. Either you fill up with transcendental message, or you fill up with rubbish nonsense. Two ways. So if you take care that your earholes are always filled up with the transcendental message of Krsna, so there is no scope for rubbish things to enter into it. So therefore our attempt should be twenty-four hours hearing. Kirtaniyah sada harih [Cc. Adi 17.31]. Twenty-four hours. As soon as you get time, read books, discuss amongst yourself, [indistinct]. Don't fill up the ears with rubbish things. Then advance will be choked up.

June 17, 1972, Los Angeles