Tattva Sandarbha is a foundational text in the Gaudiya Vaishnavism tradition, authored by the philosopher Jiva Goswami in the 16th century. It serves as the first of six Sandarbhas, which systematically present the philosophical principles of Vedanta and the nature of reality, focusing on the relationship between the divine and the material world. The text elaborates on key concepts such as Brahman, Paramatma, and Bhagavan, explaining their significance in understanding the ultimate truth. It emphasizes the importance of devotion and the role of Krishna as the supreme deity, guiding practitioners in their spiritual journey.