The Epistles of Ikhwan al-Safa (Brethren of Purity) represent one of the most significant intellectual achievements of the Islamic Golden Age. Penned by a mysterious 10th-century secret society based in Basra, these 52 epistles aim to synthesize Greek philosophy with Islamic thought, covering a vast array of subjects including mathematics, logic, natural sciences, metaphysics, ethics, and theology. This particular volume, 4/1, contributes to the monumental collection, meticulously researched and compiled by the renowned scholar Butrus al-Bustani, offering profound insights into the esoteric wisdom and scientific advancements championed by the Brethren of Purity, making it an indispensable resource for scholars of Islamic intellectual history.