|Ādi-līlā||Chapter 2: Śrī Caitanya Mahāprabhu Is the Supreme Personality of Godhead|
Bhaktivedanta VedaBase: Śrī Caitanya Caritāmṛta Ādi 2.109
sei kṛṣṇa avatārī vrajendra-kumāra
āpane caitanya-rūpe kaila avatāra
sei — that; kṛṣṇa — Lord Kṛṣṇa; avatārī — the source of all incarnations; vrajendra-kumāra — the son of the King of Vraja; āpane — personally; caitanya-rūpe — in the form of Lord Caitanya Mahāprabhu; kaila — made; avatāra — incarnation.
That same Lord Kṛṣṇa, the fountainhead of all incarnations, is known as the son of the King of Vraja. He has descended personally as Lord Śrī Caitanya Mahāprabhu.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness