The Supreme Lord is cognizant and all-powerful, and by His causeless mercy He empowers a living entity to receive His mercy. Being under the spell of conditional life, people in general are averse to rendering devotional service and practicing Kṛṣṇa consciousness. In fact, most people are unaware of the principal teachings of Kṛṣṇa consciousness regarding one's eternal relationship with the Supreme Personality of Godhead and the ultimate goal of life, which is to return home, back to Godhead. Nor are people aware of the process by which one can return to the spiritual world. Because these important subject matters are unknown to the conditioned soul, Lord Caitanya, out of His causeless mercy, instructed Rūpa Gosvāmī in the principles of devotional service. Later, for the good of the people in general, Rūpa Gosvāmī distributed this information of the science of devotional service.
In the prologue to Bhakti-rasāmṛta-sindhu (1.1.2), Rūpa Gosvāmī wrote the following:
- hṛdi yasya preraṇayā pravartito 'haṁ varāka-rūpo 'pi
- tasya hareḥ pada-kamalaṁ vande caitanya-devasya
"I offer my respectful obeisances unto the lotus feet of the Supreme Personality of Godhead, known as Lord Caitanyadeva, because due to His inspiration I feel the desire within my heart to write something about devotional service. For this reason I am engaged in writing this book on the science of devotion known as Bhakti-rasāmṛta-sindhu."
When Lord Caitanya began His instructions to Rūpa Gosvāmī, He first told him, "My dear Rūpa, the science of devotional service is just like the great ocean, and it is not possible to show you all its length and breadth. However, I shall try to explain the nature of that ocean by taking just one drop out of it. In this way you can taste it and understand what that ocean of devotional service actually is.