CC Madhya 8.160

premera parama-sāra ‘mahābhāva’ jāni
sei mahābhāva-rūpā rādhā-ṭhākurāṇī

premera—of love of Godhead; parama-sāra—the essential part; mahā-bhāva—the transcendental ecstasy of the name mahābhāva; jāni—we know; sei—that; mahā-bhāva-rūpā—the personification of the mahābhāva transcendental ecstasy; rādhā-ṭhākurāṇī—Śrīmatī Rādhārāṇī.

“The essential part of love of Godhead is called mahābhāva, transcendental ecstasy, and that ecstasy is represented by Śrīmatī Rādhārāṇī.