Your friend saw this resource on bethinking.org and thought you should see it:
Why Are There Differences in the Gospels?
A review of Michael Licona's attempt to explain differences in the Gospel narratives by looking at the work of Plutarch.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/is-the-bible-reliable/why-are-there-differences-in-the-gospels
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bethinking.org is a collection of resources which aims to make sense of the big questions of life about God, Jesus and Christianity.