This (Sri Uddhava Sandesh & Sri Hamsaduta) is another masterpiece from our acarya, Srila Prabhupada Rupa Goswami. These stories were written in the way to be understood by ordinary people and may serve as us as windows to the spiritual reality. This is the story of Vasudeva Krsna pouring out His heart to His intimate friend Uddhava. Krishna sent a message of love through His very dear and intimate devotee, Uddhava. That message is known as uddhava-sandesa. The tenth canto of Srimad Bhagavatam also speaks about uddhava-sandesa, the message Krishna sent for Nanda, Yasoda and the gopis. The intense separation felt by the gopis, especially Radharani, is described there.