The intelligent, who have understood the Supreme Lord in association with pure devotees and have become freed from bad materialistic association, can never avoid hearing the glories of the Lord, even though they have heard them only once.
The flow of devotional service is so potent that any onlooker also becomes liberated from the influence of the modes of passion and ignorance.
If, by the grace of the Lord and the great-souled devotees of the Lord, a living being becomes fortunate enough to associate with the unadulterated devotees of the Lord and gets a chance to hear the unadulterated glories of the Lord, certainly the flow of devotional service takes place like the flow of a river.
By the association of pure devotees all the obstacles are removed.