The Commentaries on John are the earliest work of Christian exegesis which has come down to us, and are therefore placed in this volume before those on Matthew. The first five books on John were written at Alexandria before Origen’s compulsory withdrawal from that city to Cæsarea in 231. In chaps. 4 and 8 of the first book he speaks of this work as being the first fruits of his activity as a writer on Holy Scripture. The sixth book, as he tells us in vi. 1, had been begun at Alexandria, but the manuscript had been left behind, so that a new beginning had to be made at Cæsarea. The work was again interrupted by the persecution of Maximian in 238; the volumes from the twenty-second to the last were written after that date. At the end of the thirty-second volume, which is the last we now possess, the writer has only reached John xiii. 33, but he tells us in his Commentary on Matthew that he has spoken of the two thieves in his work on John. In the time of Eusebius only twenty-two books survived out of the whole number, which seems to have been thirty-nine. We now possess books i., ii., vi., x., xiii., xix., xx., xxviii., xxxii., some of which, however, are not complete, and a few fragments. The thirteenth book begins in the middle of the story of the Samaritan woman. Ambrosius had wished that story to be completed in the twelfth book, but Origen did not like to make his books too long, and on this point disregarded the authority of his mentor. The nineteenth and twentieth books are both occupied with the eighth chapter of John, which, if it was all treated on the same scale, must have occupied two more books in addition to these. The thirty-second book scarcely completes the thirteenth chapter of the Gospel; and if the remaining chapters only occupied seven books, the treatment of these must have been much more condensed.