Krishna goes on describing his infinte aspect ,and he says that among the trees, he is the pepul tree . He, also mentions that among the divine sages he is Narada, among the Gandharvas he is Cithartha, and among the perfected sage he is kapila . This way, he describe the aspect of soul, expressed in the world.
Sage Narada is one of the Greatest Example of Devotion . If you absorb the works at Sage Narada then you can understand , he has reached a highest level of perfection in Devotion. He wrote “Aphorism of Bhakti “ which gives you an solid framework, on developing Pure Bhakti . The soul represented by Lord Krishna, which stays in oneness , expresses as Narada which indicates the perfection of Inifinite Devotion .