Krishna, who is the one supreme absolute truth, expands himself as Radha or Srimati Radharani, who is the source of energies of the Lord.
Srimati Radharani is love and compassion personified. Thus Krishna is the supreme object of love and Srimati Radharani is the supreme abode of love. She is the fountainhead of all unconditioned love. Srimati Radharani is the origin and the supreme embodiment of this highest principle of love. And therefore Krishna is eternally subordinate to Srimati Radharani’s love. She enchants the heart of Krishna. She is hara which means she steals the mind of Krishna. It is explained that Krishna considers himself to be like an ornament decorating the love of Srimati Radharani.
Krishna is the supreme absolute truth and the source of everything. But all of his happiness and all of his pleasure comes from Srimati Radharani. She is Hladini Shakti , his pleasure potency. Whatever love any living entity can have on the spiritual platform is an insignificant part and parcel of the love that emanates from Srimati Radharani.
The supreme love of Srimati Radharani towards Krishna in the most selfless and pure state manifests towards all the living beings as compassion. Love and compassion are inseparable. Where there is love, there is selfless service in the spirit of compassion. Radharani is the power of love of God and also the power of compassion of God.
Srimati Radharani is the original supreme devotee. To be her servant is the sure path of perfection.
– Radhanath Swami