After Narada heard the glories of gopi-bhava (the exalted moods of the gopis) from the mouth of Vrnda-devi, the presiding deity of Vrndavana, an intense desire to lovingly serve the Divine Couple Sri Radha-Krsna as a gopi in Their most elevated amorous pastimes arose in his heart. He received the gopala-mantra from Brahma, the Grandsire of the world, and began to perform meditation and worship in raga-marga, the path of spontaneous attachment, in the wake of the gopis.
After doing