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CC Ādi 4.49

prauḍha nirmala-bhāva prema sarvottama
kṛṣṇera mādhurya-rasa-āsvāda-kāraṇa
Synonyms: 
prauḍha — matured; nirmala-bhāva — pure condition; prema — love; sarva-uttama — best of all; kṛṣṇera — of Lord Kṛṣṇa; mādhurya-rasa — of the mellow of the conjugal relationship; āsvāda — of the tasting; kāraṇa — the cause.
Translation: 
Her pure, mature love surpasses that of all others. Her love is the cause of Lord Kṛṣṇa’s tasting the sweetness of the conjugal relationship.