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CC Madhya 20.126

kṛṣṇa-mādhurya-sevānanda-prāptira kāraṇa
kṛṣṇa-sevā kare, āra kṛṣṇa-rasa-āsvādana
Synonyms: 
kṛṣṇa-mādhurya — of an intimate relationship with Kṛṣṇa; sevā-ānanda — of pleasure from rendering service unto Him; prāptira — of achievement; kāraṇa — because; kṛṣṇa-sevā kare — one renders service to Kṛṣṇa; āra — and; kṛṣṇa-rasa — of the mellows of such service; āsvādana — tasting.
Translation: 
“When one attains the transcendental bliss of an intimate relationship with Kṛṣṇa, he renders service to Him and tastes the mellows of Kṛṣṇa consciousness.