In Bhakti-Ratnakara, it is written that one day Sanatana Goswami went to Radha-Kunda to see Sri Rupa and Sri Raghunatha Dasa Goswami. When they saw Sanatana approaching, they rose to offer him respect, and then offered him a seat. With this, the three of them began an ishta-gosthi, a discussion about Krishna. Sri Rupa Goswami had written a Stotram to Radharani called "Chatu-Pushpanjali" - an offering of four flowers. Sri Sanatana Goswami read the verses, and was struck by one in particular:
navagorochana gauri, pravarendi varamvaram,
manistavaka-vidyoti-veni-vyalangana-phanam
"O Vrindabaneshvari! I offer my respects unto you. Because your complexion is like newly molten gold, you are known as Gaurangi. Your dress is beautiful like that of a blue lotus. Your long braid of hair resembles a black serpent decorated with jewels."
When Sanatana saw the line, "Your braided hair resembles a black serpent..." he thought about this comparison and said, "Is this a logical or reasonable metaphor? To compare Radharani's hair to a serpent?"
That afternoon Sri Sanatana went to Radha Kunda to take his bath. After offering different reverential prayers to the Radha Kunda, he took his bath there. At that time, a little distance from the Kunda, he could see some gopi boys and girls playing, at the foot of some trees. As he glanced in their direction, he could just make out that right behind the head of one of the girls was what might have been a long, black, dangling braid, but looked to Sanatana Goswami much more like a deadly snake, swaying back and forth as if ready to strike. At that time he called out, "O young girl! Be careful: there is a snake creeping up on your back!" The young girl, caught up in the joy of her playing, took no notice. Apparently she couldn't hear him. Thereupon he went running up to her and saw that the girl was none other than Sri Radha Thakurani. When the gopas and gopis saw him, they burst out laughing. They laughed and laughed for some time without stopping. Sri Sanatana Goswami was struck dumb. After this, he could understand the logic of Sri Rupa Goswami's metaphor.
All Glories to Rasik Saints. All Glories to Braj Dham.