CC Ādi 2.120

caitanya-gosāñira ei tattva-nirūpaṇa
svayaṁ-bhagavān kṛṣṇa vrajendra-nandana
Word for word: 
caitanya-gosāñira — of Lord Caitanya Mahāprabhu; ei — this; tattva — of the truth; nirūpaṇa — settling; svayam-bhagavān — Himself the Supreme Personality of Godhead; kṛṣṇa — Lord Kṛṣṇa; vrajendra-nandana — the son of the King of Vraja.
Translation: 
The conclusion is that Lord Caitanya is the Supreme Personality of Godhead, Kṛṣṇa, the son of the King of Vraja.