Radharani thinks always Herself as the lowest of the devotees. She thinks always. She sees always that the gopis, other gopis, they are better qualified to serve Krsna, and She is not qualified, so much qualified. Therefore in Vrndavana, you’ll find the devotees approach Radharani: “Jaya Radhe,” because if Radharani advocates for him to Krsna, it is very easily accepted. And Radharani says… If Radharani’s pleased, then He [She] represents the devotee’s case that “Here is a devotee. He’s better than Me. Kindly accept his service, Krsna.” So Krsna cannot deny. So maha-bhava. Radharani is maha-bhava.

From Srila Prabhupada’s lecture on The Nectar of Devotion — October 23, 1972, Vrndavana