In his Harmony of the Gospels, Augustine of Hippo produced a 5th-century attempt to explain away all of the apparent contradictions he was aware of.[79] He wrote that because there are those who would "rob [the Evangelists] of their credit as veracious historians", "we must prove that the writers in question do not stand in any antagonism to each other."[80] Whereas more modern apologists, such as Gleason Archer, in producing a book that provides explanations for many Bible difficulties, writes: "Be fully persuaded in your own mind that an adequate explanation exists, even though you have not yet found it."[81]