Bhakti-rasāmṛta-sindhu .1.3
ato ’tra pāñcavidhyena laharyaḥ pañca kīrtitāḥ |
[ato ’tra paanchavidhyena laharyah pancha keertitaah |]
athāmī pañca lakṣyante rasāḥ śāntādayaḥ kramāt ||3||
[athaamee pancha lakshyante rasaah shaantaadayah kramaat ||3||]
Blended reading (Sanskrit + English inline)
ato ’tra pāñcavidhyena laharyaḥ pañca kīrtitāḥ |
athāmī pañca lakṣyante rasāḥ śāntādayaḥ kramāt ||3||
In this western section, the five waves are named according to the five types of rasa. Thus, following in succession, the chapters or waves are designated as the five rasas starting with śānta.
Purport
These five items will be very elaborately explained here, and thus they have been figuratively described as the five waves on the western side of this ocean of the nectar of devotion.
— A.C. Bhaktivedanta Swami Prabhupāda
Gauḍīya Ācāryas
Jīva Gosvāmī
Gauḍīya
Durgama-saṅgamanī
Commentary
Because of the practice of identifying the rasa with what possesses the rasa, the chapters are designated as rasa.
My note
Source: vedabase.io