Thus he can be compared to a deep lake covered with moss. He was the object of pleasure for all the devotees who knew the science of devotional service

Expressions researched:
"Thus he can be compared to a deep lake covered with moss. He was the object of pleasure for all the devotees who knew the science of devotional service"

Sri Caitanya-caritamrta

CC Madhya-lila

He possessed all the opulences of a royal position, but he gave up everything just to accept the youthful goddess of renunciation. Although he externally appeared to be a mendicant who had renounced everything, he was filled with the pleasure of devotional service within his heart. Thus he can be compared to a deep lake covered with moss. He was the object of pleasure for all the devotees who knew the science of devotional service.

CC Madhya 24.348, Translation and Purport

Śrīla Sanātana Gosvāmī, the elder brother of Śrīla Rūpa Gosvāmī, was a most important minister in the government of Hussain Shah, the ruler of Bengal, and he was considered a most brilliant gem in that assembly. He possessed all the opulences of a royal position, but he gave up everything just to accept the youthful goddess of renunciation. Although he externally appeared to be a mendicant who had renounced everything, he was filled with the pleasure of devotional service within his heart. Thus he can be compared to a deep lake covered with moss. He was the object of pleasure for all the devotees who knew the science of devotional service.

This and the following two verses are from Caitanya-candrodaya-nāṭaka (9.34, 35, 38).