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The Nectar of Devotion
ācāryas  (holy teachers), who are compared with sharks in the great ocean of nectar and who do not care for the various rivers of liberation. Impersonalists are very fond of merging into the supreme, like rivers that come down and merge into the ocean. The ocean can be compared with liberation and the rivers with all the different paths of liberation. The impersonalists are dwelling in the river water, which eventually comes to mix with the ocean. They have no information, however, that within the ocean, as within the river, there are innumerable aquatic living entities. The sharks who dwell in the ocean do not care for the rivers which are gliding down into it. The devotees eternally live in the ocean of devotional service, and they do not care for the rivers. In other words, those who are pure devotees always remain in the ocean of transcendental loving service to the Lord and have no business with the other processes, which are compared to the rivers that only gradually come to the ocean.
Śrīla Rūpa Gosvāmī prays to his spiritual master, Śrīla Sanātana Gosvāmī, for the protection of  Bhakti-rasāmṛta-sindhu —the Ocean of the Pure Nectar of Devotional Service—from the argumentative logicians who unnecessarily meddle in the science of service to the Lord. He compares their arguments and logic to volcanic eruptions in the midst of the ocean. In the midst of the ocean such volcanic eruptions can do very little harm, and similarly, those who are against devotional service to the Lord and who put forward many philosophical theses about the ultimate transcendental realization cannot disturb this great ocean of devotional service.
The author of  Bhakti-rasāmṛta-sindhu , Śrīla Rūpa Gosvāmī, very humbly submits that he is just trying to spread Kṛṣṇa consciousness all over the world, although he humbly thinks himself unfit for this work. That should be the attitude of all preachers of the Kṛṣṇa consciousness movement, following in the footsteps of Śrīla Rūpa Gosvāmī. We should never think of ourselves as great preachers, but should always consider that we are simply instrumental to the previous  ācāryas , and simply by following in their footsteps we may be able to do something for the benefit of suffering humanity.
Bhakti-rasāmṛta-sindhu  is divided into four parts, just as the ocean is sometimes divided into four parts, and there are different sections