These are Verses of very beautiful poetry which stimulate the sentiment of bhakti, devotional serive to God. Stringing these verses together, Sanatana Goswami has composed a necklace for the benefit of the sadhakas, devotees, of this world, and when sadhakas keep these verses in their hearts, it is as if they are wearing this necklace around their necks. And if while taking Harinama, chanting, they sometimes call out these verses, it will increase the ananda, bliss, in their chanting. This compilation of verses is known as bhakti rasayana, or the nectar tonic of bhakti rasa.
Bhakti tattva viveka.