katha imas te kathita mahiyasam
vitaya lokesu yasah pareyusam
vaco-vibhutir na tu paramarthyam
Sukadeva Gosvami said: O mighty Pariksit, I have related to you the narrations of all these great kings, who spread their fame throughout the world and then departed. My real purpose was to teach transcendental knowledge and renunciation. Stories of kings lend power and opulence to these narrations but do not in themselves constitute the ultimate aspect of knowledge.
Since all the narrations of Srimad-Bhagavatam bring the reader to the perfection of transcendental knowledge, they all give supreme spiritual lessons though apparently dealing with kings or other mundane subject matter. In relation with Krsna, all ordinary topics become transcendental narrations, with the power to bring the reader to the perfection of life.