The topmost surrendered devotee are the gopis. There is no more higher exalted devotees than the gopis. Therefore Caitanya Mahaprabhu recommended that the gopis, ramya kacid upasana vraja-vadhu-vargena ya kalpita. There is no better type of worshiping Krsna than the method by which gopis worship Krsna. They, their love was so intense that they did not care for any family, any honor or any prestige — nothing. That is the highest, topmost loving stage of Krsna. And Krsna also loved the gopis, so much so that Krsna asked them that “You cannot expect any return from Me for your ecstatic love. I cannot give you. It is beyond My power.” So they purchased Krsna. And the topmost gopi is Radharani.

From Srila Prabhupada’s lecture on Srimad-Bhagavatam 1.7.15 — September 13, 1976, Vrndavana