CC Madhya 23.99

ei rasa-āsvāda nāhi abhaktera gaṇe
kṛṣṇa-bhakta-gaṇa kare rasa āsvādane
Synonyms: 
ei — this; rasa-āsvāda — tasting of transcendental mellows; nāhi — not; abhaktera gaṇe — among nondevotees; kṛṣṇa-bhakta-gaṇe — the pure devotees of Lord Kṛṣṇa; kare — do; rasa — these transcendental mellows; āsvādane — tasting.
Translation: 
“The exchange between Kṛṣṇa and different devotees situated in different transcendental mellows is not to be experienced by nondevotees. Advanced devotees can understand and appreciate the different varieties of devotional service reciprocated with the Supreme Personality of Godhead.