'ujjvala-nīlamaṇi'-nāma grantha kaila āra
rādhā-kṛṣṇa-līlā-rasa tāhāṅ pāiye pāra
ujjvala-nīla-maṇi—Ujjvala-nīlamaṇi; nāma—named; grantha—scripture; kaila—compiled; āra—also; rādhā-kṛṣṇa-līlā-rasa—the transcendental mellow of the pastimes of Rādhā and Kṛṣṇa; tāhāṅ—there; pāiye—we get; pāra—the extreme limit.
Śrīla Rūpa Gosvāmī also compiled the book named Ujjvala-nīlamaṇi, from which one can understand, to the fullest limits, the loving affairs of Śrī Śrī Rādhā and Kṛṣṇa.
Link to this page: https://prabhupadabooks.com/cc/antya/4/224