Today is Radhastami, the "appearance day" of Srimati Radharani. In a class on Bhagavad-Gita (74/09/23 Calcutta, Bhagavad-gita 4.10 ), His Divine Grace A.C. Bhaktivedanta Swami Prabhupada explains...

"So we shall pray to Radharani... What is Radharani? Radharani is the pleasure potency of Krsna. Pleasure potency. Parasya saktir vividhaiva sruyate [Cc. Madhya 13.65, purport]. The Supreme Lord has many potencies. Na tasya karyam karanam ca vidyate. Therefore He has nothing to do. He has got so many potencies. Just like big man, a rich man. He's sitting. But his energies, his potencies, are working. Big, big factory. And he knows everything. Similarly, parasya saktir vividhaiva sruyate. He has got many multi-potencies. One of them is this pleasure potency. Pleasure potency...

He also wants pleasure. So when Krsna wants... Krsna is Param Brahman. He cannot enjoy anything material. He has to create the source of enjoyment by His own spiritual potency. That is Radharani. So Radharani is described in the sastra: radha-krsna-pranaya-vikrtir hladini-saktir asmad [Cc. Adi 1.5]. That is Krsna's hladini-sakti. She gives pleasure to Krsna. So She is very kind. And today is Radhastami. If we pray to Srimati Radharani... Therefore in Vrndavana you'll see. They are first of all glorifying, "Jaya Radhe!" Everywhere you'll hear. "Jaya Radhe."

In another Radhastami class, Srila Prabhupada says that "Krishna is Radharani's property." If we want to approach Krishna, we have to go through Radha first.

Sri Sri Radhe Shyam ki Jaya!