CC Antya-lila 16.119 - Govinda-lilamrta 8.8
Sri Caitanya-caritamrta
CC Antya-lila
CC Antya 16.119, Translation and Purport:
""My dear friend, the all-surpassing nectar from the lips of the Supreme Personality of Godhead, Kṛṣṇa, can be obtained only after many, many pious activities. For the beautiful gopīs of Vṛndāvana, that nectar vanquishes the desire for all other tastes. Madana-mohana always chews pan that surpasses the nectar of heaven. He is certainly increasing the desires of My tongue.""
This verse is found in the Govinda-līlāmṛta (8.8).