The textual commentary treats Augustine's text of John verse by verse, concentrating on variants from the Vulgate. There are a number of occasions on which Augustine has a reading not attested in surviving Latin manuscripts: on some occasions this is shared with other Church Fathers, while others remain unique to him. The distinction between primary and secondary citations is important in determining which readings should be cited in an edition of the Gospel. The form of his mental text is given for a number of verses, with comments on how it may have arisen. Brief details are sometimes given of Augustine's exegesis, with bibliographic references to further studies. Passages of particular interest include John 7:53-8:11 (the Woman taken in Adultery), in which Augustine provides the earliest attestation of several variants in John 8:9. He also has an intriguing treatment of the contested verses John 5:2-4 (the Angel stirring the Waters), and shows evidence for the interpolation at John 3:6. His text of John 21:18 suggests that a Greek variant only preserved in Codex Bezae may underlie the entire Latin tradition.
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