The Nectar of Devotion is a summary study of Bhakti-rasāmṛta-sindhu, which was written in Sanskrit by Śrīla Rūpa Gosvāmī Prabhupāda. He was the chief of the six Gosvāmīs, who were the direct disciples of Lord Caitanya Mahāprabhu. When he first met Lord Caitanya, Śrīla Rūpa Gosvāmī Prabhupāda was engaged as a minister in the Muhammadan government of Bengal. He and his brother Sanātana were then named Dabira Khāsa and Sākara Mallika respectively, and they held responsible posts as ministers of Nawab Hussain Shah.
(Nectar of Devotion).

They very scrutinizingly studied all the Vedic scriptures in order to establish the cult of Caitanya Mahāprabhu on the authorized principles of Vedic knowledge. The present Kṛṣṇa consciousness movement is also based on the authority of Śrīla Rūpa Gosvāmī Prabhupāda. We are therefore generally known as rūpānugas, or followers in the footsteps of Śrīla Rūpa Gosvāmī Prabhupāda. It is only for our guidance that Śrīla Rūpa Gosvāmī prepared his book Bhakti-rasāmṛta-sindhu, which is now presented in the form of The Nectar of Devotion. Persons engaged in the Kṛṣṇa consciousness movement may take advantage of this great literature and be very solidly situated in Kṛṣṇa consciousness.
(Nectar of Devotion).

Let me offer my respectful obeisances unto the lotus feet of Śrīla Rūpa Gosvāmī Prabhupāda and of Śrīla Bhaktisiddhānta Sarasvatī Gosvāmī Prabhupāda, by whose inspiration I have been engaged in the matter of compiling this summary study of Bhakti-rasāmṛta-sindhu. This is the sublime science of devotional service as propounded by Śrī Caitanya Mahāprabhu, who appeared five hundred years ago in West Bengal, India, to propagate the movement of Kṛṣṇa consciousness.
Śrīla Rūpa Gosvāmī begins his great book by offering his respectful obeisances unto Śrī Sanātana Gosvāmī, who is his elder brother and spiritual master, and he prays that Bhakti-rasāmṛta-sindhu may be very pleasing to him. He further prays that by residing in that ocean of nectar, Śrī Sanātana Gosvāmī may always feel transcendental pleasure in the service of Rādhā and Kṛṣṇa.

(Nectar of Devotion).

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, 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.

(Nectar of Devotion).

Bhakti-rasāmṛta-sindhu is divided into four parts, just as the ocean is sometimes divided into four parts, and there are different sections within each of these four divisions. Originally, in Bhakti-rasāmṛta-sindhu, the ocean is divided like the watery ocean into east, south, west and north, while the subsections within these different divisions are called waves. As in the ocean there are always different waves, either on the eastern side, the southern side, the western side or the northern side, Bhakti-rasāmṛta-sindhu similarly has different waves. In the first part there are four waves, the first being a general description of devotional service. The second concerns the regulative principles for executing devotional service, and the third wave, devotional service in ecstasy. In the fourth is the ultimate goal, love of God. These will be explicitly described along with their different symptoms.

(Nectar of Devotion).

The definition of a pure devotee, as given by Rūpa Gosvāmī in Bhakti-rasāmṛta-sindhu, can be summarized thus: his service is favorable and is always in relation to Kṛṣṇa. In order to keep the purity of such Kṛṣṇa conscious activities, one must be freed from all material desires and philosophical speculation. Any desire except for the service of the Lord is called material desire. And "philosophical speculation" refers to the sort of speculation which ultimately arrives at a conclusion of voidism or impersonalism. This conclusion is useless for a Kṛṣṇa conscious person. Only rarely by philosophical speculation can one reach the conclusion of worshiping Vāsudeva, Kṛṣṇa. This is confirmed in the Bhagavad-gītā itself. The ultimate end of philosophical speculation, then, must be Kṛṣṇa, with the understanding that Kṛṣṇa is everything, the cause of all causes, and that one should therefore surrender unto Him. If this ultimate goal is reached, then philosophical advancement is favorable, but if the conclusion of philosophical speculation is voidism or impersonalism, that is not bhakti.

(Nectar of Devotion).

The three categories of devotional service which Śrīla Rūpa Gosvāmī describes in Bhakti-rasāmṛta-sindhu are listed as devotional service in practice, devotional service in ecstasy and devotional service in pure love of Godhead. There are many subheadings in each of these categories. Generally it is understood that in the category of devotional service in practice there are two different qualities, devotional service in ecstasy has four qualities, and devotional service in pure love of Godhead has six qualities. These qualities will be explained by Śrīla Rūpa Gosvāmī later on.

(Nectar of Devotion).

Here is a general description of devotional service given by Śrī Rūpa Gosvāmī in his Bhakti-rasāmṛta-sindhu. Previously, it has been stated that devotional service can be divided into three categories—namely devotional service in practice, devotional service in ecstasy and devotional service in pure love of God. Now Śrī Rūpa Gosvāmī proposes to describe devotional service in practice.

(Nectar of Devotion).

Such an idea is not accepted in any part of the Vedic literature. It is a fact that by chanting the holy name of the Lord one becomes washed clean of all sinful activities from his past life. But that does not mean that after being washed off, one should again begin sinful activities and expect to be washed again. These are nonsensical propositions and are not admitted in devotional service. Someone may think, "For a whole week I may commit sinful activities, and for one day I will go to the temple or church and admit my sinful activities so that I can become washed off and again begin my sinning." This is most nonsensical and offensive and is not acceptable to the author of Bhakti-rasāmṛta-sindhu.

(Nectar of Devotion).

In the Ādi Purāṇa there is the following statement by Lord Kṛṣṇa Himself, addressed to Arjuna: "My dear Pārtha, one who claims to be My devotee is not so. Only a person who claims to be the devotee of My devotee is actually My devotee." No one can approach the Supreme Personality of Godhead directly (CC.13:180). One must approach Him through His pure devotees. Therefore, in the system of Vaiṣṇava activities, the first duty is to accept a devotee as spiritual master and then to render service unto him.
Śrī Rūpa Gosvāmī affirms that all the quotations given in the Bhakti-rasāmṛta-sindhu from different scriptures are accepted by the great ācāryas and devotees of the Lord.

(Nectar of Devotion).