An excerpt from a lecture entitled "The Jewel Book":

"Sri Gita-Govinda is a "jewel book" brought by Sri Caitanya Mahaprabhu. We all know that Sri Jayadeva Gosvami has written this beautiful Gita Govinda, but without Sri Caitanya Mahaprabhu it would have remained locked like a pearl in the oyster shell or a jewel in a locked case. Sri Caitanya Mahaprabhu manifested the glories of Sri Gita Govinda. Just as without Srila Rupa Gosvami no one would have known the inner moods of Sri Caitanya Mahaprabhu, similarly, by Sri Caitanya Mahaprabhu relishing the moods of Sri Gita Govinda its glories became manifest for the whole world. I have explained this very high-class philosophy, but only rare devotees in this world can understand it. I have called you here only to give you this."