CC Adi 4.83: "The transcendental goddess Srimati Radharani is the direct counterpart of Lord Sri Krishna. She is the central figure for all the goddesses of fortune. She possesses all the attractiveness to attract the all-attractive Personality of Godhead. She is the primeval internal potency of the Lord."
saptame gaura-varna-vishnor ity anena sva-saktya caikyametya prante pratar avatirya saha dvaih svam anusikshayati
In the seventh manvantara (Vaivasvata Manu), the Supreme Personality of Godhead Shri Gaura-Vishnu will accept a golden complexion due to attaining oneness with His pleasure potency Shrimati Radhika and descend on this earth [...]" Purusha-bodhini Upanishad-Atharva-veda, 6th Prapathaka