"So Radharani is expansion of Krishna. Krishna is the energetic, and Radharani is the energy. Just like energy and energetic, you cannot separate. Fire and the heat you cannot separate. Wherever there is fire there is heat, and wherever there is heat there is fire. Similarly, wherever there is Krishna there is Radha. And wherever there is Radha there is Krishna. They are inseparable."
(Srila Prabhupada lecture, August 30, 1968)
(*Sri Sri Radha Karuna-sindu are the presiding Deities of Bhakta dasa and Bhakti devi dasi's home in Australia.)