CC Adi-lila 04.070 - Ujjvala-nilamani
Sri Caitanya-caritamrta
CC Adi-lila
CC Adi 4.70, Translation and Purport:
"Of these two gopīs (Rādhārāṇī and Candrāvalī), Śrīmatī Rādhārāṇī is superior in all respects. She is the embodiment of mahābhāva, and She surpasses all in good qualities."
This is a quotation from Śrīla Rūpa Gosvāmī’s Ujjvala-nīlamaṇi (Rādhā-prakaraṇa 3).