CC Ādi 4.27-28
kariba vividha-vidha adbhuta vihāra
se se līlā kariba, yāte mora camatkāra
Lord Kṛṣṇa in the form of Lord Caitanya educates His devotees to develop progressively to the stage of pure devotional service. Thus He appears periodically as a devotee to take part in various wonderful activities depicted in His sublime philosophy and teachings.
There are innumerable Vaikuṇṭha planets in the spiritual sky, and in all of them the Lord accepts the service rendered by His eternal devotees in a reverential mood. Therefore Lord Śrī Kṛṣṇa presents His most confidential pastimes as He enjoys them in His transcendental realm. Such pastimes are so attractive that they attract even the Lord, and thus He relishes them in the form of Lord Caitanya.