CC Adi lila 4.87:
"krsna vancha purti rupa kare aradhane ataeva radhika nama purane vakhane"
Her worship (aradhana) consists of fulfilling the desires of Lord Krsna. Therefore the Puranas call Her Radhika.
His Divine Grace, Srila A.C. Bhaktivedanta Swami Prahbupada, on Radhastami, September 18, 1969, in London spoke the following:
"So what is the position of Srimati Radharani? We should try to understand this day and offer our obeisances to Radharani. Radhe vrndavanesvari.
tapta-kancana-gaurangi radhe vrndavanesvari
vrsabhanu-sute devi pranamami hari-priye
Our business is "Radharani, You are so dear to Krsna. So we offer our respectful obeisances unto You."
tapta-kancana-gaurangi radhe vrndavanesvari
vrsabhanu-sute devi pranamami hari-priye
Radharani is hari-priya, very dear to Krsna. So if we approach Krsna through Radharani, through the mercy of Radharani, then it becomes very easy. If Radharani recommends that "This devotee is very nice," then Krsna immediately accepts, however fool I may be. Because it is recommended by Radharani, Krsna accepts. Therefore in Vrndavana you'll find all the devotees, they're chanting more Radharani's name than Krsna's. Wherever you'll go, you'll find the devotees are addressing, "Jaya Radhe." You'll find still in Vrndavana. They are glorifying Radharani. They're more interested, worshiping Radharani. Because however fallen I may be, if some way or other I can please Radharani, then it is very easy for me to understand Krsna. Otherwise, manusyanam sahasresu kascid yatati siddhaye yatatam api siddhanam kascid vetti mam tattvatah (Bg. 7.3)
If you go by the speculative process to understand Krsna, it will take many, many lives. But if you take devotional service, just try to please Radharani, and Krsna will be gotten very easily. Because Radharani can deliver Krsna. She is so great devotee, the emblem of maha-bhagavata. Even Krsna cannot understand what is Radharani's quality. Even Krsna, although He says vedaham samatitani, "I know everything," still, He fails to understand Radharani. Radharani is so great. He says that... Actually, Krsna knows everything. In order to understand Radharani, Krsna accepted the position of Radharani. Krsna wanted to understand the potency of Radharani. Krsna thought that "I am full. I am complete in every respect, but still, I want to understand Radharani. Why?" This propensity made Krsna obliged to accept the propensities of Radharani, to understand Krsna, Himself.
These are, of course, very transcendental, great science. One who is advanced in Krsna consciousness and well conversant with the sastras, they can understand. But still, we can discuss from the sastra. When Krsna wanted to understand Himself, He took the tendency of Srimati Radharani. And that is Caitanya Mahaprabhu. Radha-bhava-dyuti-suvalitam. Caitanya Mahaprabhu is Krsna, but He has accepted the propensities of Radharani. As Radharani is always in feelings of separation of Krsna, similarly, in the position of Radharani, Lord Caitanya was feeling separation of Krsna. That is the teachings of Lord Caitanya, feelings of separation, not meeting. The process of devotional service taught by Caitanya Mahaprabhu and His disciplic succession is how to feel separation from Krsna. That is Radharani's position, always feeling the separation. "
The 25 qualities of Srimati Radharani by which She captures Krsna:
1) She is sweetness personified.
2) She is a fresh young girl.
3) Her eyes are always moving.
4) She is always brightly smiling.
5) She possesses all auspicious marks on Her body.
6) She can agitate Krsna by the flavor of Her person.
7) She is expert in the art of singing.
8) She can speak very nicely and sweetly.
9) She is expert in presenting feminine attractions.
10) She is modest and gentle.
11) She is always very merciful.
12) She is transcendentally cunning.
13) She knows how to dress nicely.
14) She is always shy.
15) She is always respectful.
16) She is always patient.
17) She is very grave.
18) She is enjoyed by Krsna.
19) She is always situated on the highest devotional platform.
20) She is the abode of love of the residents of Gokula.
21) She can give shelter to all kinds of devotees.
22) She is always affectionate to superiors and inferiors.
23) She is the greatest amongst Krsna's girlfriends.
24) She is obliged by the dealings of Her associates.
25) She always keeps Krsna under Her control.
On pg 175 in "Nectar of Devotion," Srila Prabhupada writes, "A person who is unable to bear another's distress is called compassionate...Actually, because Krsna is the Supreme Personality of Godhead, it is very difficult to approach Him. But the devotees, taking advantage of His compassionate nature, which is represented by Radharani, always pray to Radharani for Krsna's compassion."