Association With Devotees
The root cause of devotional service to Lord Krishna is association with advanced devotees. Even when one's dormant love for Krishna awakens, association with devotees is still most essential.
Devotee
A devotee is considered superlative and superior according to his attachment and love.
Glories of The Spiritual Master
Since one cannot visually experience the presence of the Supersoul, He appears before us as a liberated devotee. Such a spiritual master is none other than Krishna himself.
Disciples
The disciples also know that they have to learn about the eternal relationship between God and the living entity from a self-realized soul.