CC Madhya 8.239
rādhā-kṛṣṇa-premarasa-jñānera tumi sīmā
“Now that I have actually seen your glories, what I heard about you is confirmed. As far as the pastimes of Rādhā and Kṛṣṇa in a loving mood are concerned, you are the limit of knowledge.”
Śrī Caitanya Mahāprabhu found Rāmānanda Rāya to be the best authority in transcendental knowledge of the loving affairs between Rādhā and Kṛṣṇa. In this verse the Lord actually states that Rāmānanda Rāya was the limit of this knowledge.