CC Ādi 4.198

gopī-preme kare kṛṣṇa-mādhuryera puṣṭi
mādhurye bāḍhāya prema hañā mahā-tuṣṭi
Synonyms: 
gopī-preme — the love of the gopīs; kare — does; kṛṣṇa-mādhuryera — of the sweetness of Lord Kṛṣṇa; puṣṭi — nourishment; mādhurye — the sweetness; bāḍhāya — causes to increase; prema — the love; hañā — being; mahā-tuṣṭi — greatly pleased.
Translation: 
The love of the gopīs nourishes the sweetness of Lord Kṛṣṇa. That sweetness in turn increases their love, for they are greatly satisfied.