The Gnostic Bible: Gnostic Texts of Mystical Wisdom from the Ancient and Medieval Worlds, edited by Willis Barnstone and Marvin Meyer, is a comprehensive anthology of Gnostic writings from the 1st to 13th centuries. It compiles diverse texts—including Sethian, Valentinian, Hermetic, and Cathar—emphasizing inner knowledge (gnosis) over dogma. It is highly regarded as a crucial resource for exploring the mystical and esoteric alternatives to mainstream religious development in the ancient and medieval world.