Anyone who comes in contact with Krishna, even for a moment, will derive eternal benefit. The nature of devotional service is such that once having come in contact with it, the desire for it is awakened within the heart, and one wants more. We obtain more by hearing more about Krishna. Hearing is one of the methods of engaging in devotional service, and it is the most important. Simply by giving one’s ears in submissive aural reception, one is actually engaging in devotional service to the Lord.
LFD Vol 3,Importance of Hearing, Pg 211, 2nd last paragraph