According to his Confessions, after nine or ten years of adhering to the Manichaean faith as a member of the group of "hearers", Augustine of Hippo became a Christian and potent adversary of Manichaeism (which he expressed in writing against his Manichaean opponent Faustus of Mileve), seeing their beliefs that knowledge was the key to salvation as too passive and unable to affect any change in one's life.
According to his Confessions after nine or ten years of adhering to the Manichaean faith as a member of the group of "hearers" Augustine of Hippo became a Christian and potent adversary of Manichaeism (which he expressed in writing against his Manichaean opponent Faustus of Mileve) seeing their beliefs that knowledge was the key to salvation as too passive and unable to affect any change in one's life.