The Nectar of Devotion - Bhakti Yoga explained

Srila Rupa Gosvami, the primary disciple of Sri Krishna Caitanya, crafted the Bhakti-rasamrta-sindhu (The Nectar of Devotion) as his literary masterpiece. This Sanskrit classic delves into the comprehensive science of bhakti-yoga, connecting with the Supreme through transcendental loving devotion. In this condensed analysis, Srila Prabhupada offers a full translation with occasional commentary. The subjects covered encompass the attributes of pure devotional service, the blissful love of God, the qualities of Sri Krishna, and inspiration for ecstatic love.

Rūpa Gosvāmī first met Lord Caitanya at Prayāg (Allahabad, India), and on the Daśāśvamedha bathing ghat of that holy city the Lord instructed him continually for ten days. The Lord particularly instructed Rūpa Gosvāmī on the science of Kṛṣṇa consciousness. These teachings of Lord Caitanya to Śrīla Rūpa Gosvāmī Prabhupāda are narrated in our book Teachings of Lord Caitanya.

Later, Śrīla Rūpa Gosvāmī Prabhupāda elaborated the teachings of the Lord with profound knowledge of revealed scriptures and authoritative references from various Vedic literatures. Śrīla Śrīnivāsa Ācārya describes in his prayers to the six Gosvāmīs that they were all highly learned scholars, not only in Sanskrit but also in foreign languages such as Persian and Arabian. 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.

Here is the link to the online version of this book - The Nectar of Devotion.