Vedic texts state that Lord Chaitanya is the Supreme Person, Krishna, appearing as His own worshiper. He is the combined form of Krishna and Krishna's most dear devotee, Srimati Radharani. He came to experience the love She feels for Him, and to show by example how to fully surrender to Krishna.

Srimad-Bhagavatam 1.7.13-14, purport—Lord Krishna Chaitanya is Krishna Himself in the garb of a devotee of Krishna, and therefore the versions of both Lord Krishna and Sri Krishna Chaitanya Mahaprabhu are identical.

Srimad-Bhagavatam 3.33.4, purport— Sometimes the Supreme Personality of Godhead Himself wonders how much transcendental pleasure is within Himself, and in order to taste His own potency, He sometimes takes the position of tasting Himself. Lord Chaitanya is Krishna Himself, but He appears as a devotee to taste the sweetness of the transcendental mellow in Himself which is tasted by Srimati Radharani, the greatest of all devotees.