CC Madhya 23.11

anartha-nivṛtti haile bhaktye ‘niṣṭhā’ haya
niṣṭhā haite śravaṇādye ‘ruci’ upajaya
Word for word: 
anartha-nivṛtti — disappearance of all unwanted contamination; haile — when there is; bhaktye — in devotional service; niṣṭhā — firm faith; haya — there is; niṣṭhā haite — from such firm faith; śravaṇa-ādye — in hearing, chanting and so on; ruci — taste; upajaya — awakens.
Translation: 
“When one is freed from all unwanted contamination, he advances with firm faith. When firm faith in devotional service awakens, a taste for hearing and chanting also awakens.