Why is Narada Muni not able to stay in one place? The story goes thus. Brahma was ordained by the Supreme to create and populate the world. It was described in earlier sloka that Brahma first created the Sanat Kumaras.
Though Narada Muni received the knowledge of Srimad Bhagavatham from his father Brahma, it was the Sanaka Munis who advised Narada on the procedure for saptaha (narration of Srimad Bhagavatham in seven days) and the fruits (divine benefits) thereof.