This is the first comprehensive study in the English language of the commentaries of Didymus the Blind, who was revered as the foremost Christian scholar of the fourth century and an influential spiritual director of ascetics. The writings of Didymus were censored and destroyed after his posthumous condemnation for heresy. This study recovers the uncensored voice of Didymus through the commentaries among the Tura papyri, a massive set of documents discovered in an Egyptian quarry in 1941. This neglected corpus offers an unprecedented glimpse into the internal workings of a Christian philosophical academy in the most vibrant and tumultuous cultural center of late antiquity. By exploring the social context of Christian instruction in the competitive environment of fourth-century Alexandria, Richard A. Layton elucidates the wider implications of biblical interpretation.