Sri Caitanya Mahaprabhu said, Though the hearts of the gopis are like high-standing hills, they are inundated by the waves of the nectarean ocean of Krsna's beauty. His sweet voice enters their ears and gives them transcendental bliss

Expressions researched:
"Śrī Caitanya Mahāprabhu said, “‘Though the hearts of the gopīs are like high-standing hills, they are inundated by the waves of the nectarean ocean of Kṛṣṇa’s beauty. His sweet voice enters their ears and gives them transcendental bliss.’"

Sri Caitanya-caritamrta

CC Antya-lila

Śrī Caitanya Mahāprabhu said, “‘Though the hearts of the gopīs are like high-standing hills, they are inundated by the waves of the nectarean ocean of Kṛṣṇa’s beauty. His sweet voice enters their ears and gives them transcendental bliss, the touch of His body is cooler than millions and millions of moons together, and the nectar of His bodily fragrance overfloods the entire world. O My dear friend, that Kṛṣṇa, who is the son of Nanda Mahārāja and whose lips are exactly like nectar, is attracting My five senses by force.

CC Antya 15.14, Translation and Purport

Śrī Caitanya Mahāprabhu said, “‘Though the hearts of the gopīs are like high-standing hills, they are inundated by the waves of the nectarean ocean of Kṛṣṇa’s beauty. His sweet voice enters their ears and gives them transcendental bliss, the touch of His body is cooler than millions and millions of moons together, and the nectar of His bodily fragrance overfloods the entire world. O My dear friend, that Kṛṣṇa, who is the son of Nanda Mahārāja and whose lips are exactly like nectar, is attracting My five senses by force.

This verse is found in the Govinda-līlāmṛta (8.3), by Śrīla Kṛṣṇadāsa Kavirāja.