Bhakti-rasamrita-sindhu is a foundational text in the Gaudiya Vaishnavism tradition, authored by Rupa Goswami in the 16th century. It explores the concept of bhakti, or devotional love for Krishna, and outlines various emotional states and relationships that devotees can experience in their spiritual practice. The text categorizes different types of rasas, or flavors of devotion, emphasizing the importance of pure love and devotion in achieving a deep connection with the divine. It serves as a guide for practitioners to cultivate their spiritual emotions and deepen their relationship with God.