There are three desires. How deep is the love of Śrīmatī Rādhikā, and what is its glory. What sweetness in Me does she taste by that love — for the more love one has, the fuller the taste, and only she can drink My mādhurī-amṛta to the bottom. And what happiness does she feel while she tastes it. In Vṛndāvana Kṛṣṇa was fulfilling every desire of His, yet these three cannot be fulfilled within Kṛṣṇa-līlā: to know Rādhikā's love from the inside one must stand in her place. So He takes her bhāva and her radiance and comes as Śrī Caitanya.