Origin by Dan Brown, and the Origin of a Saying

I finished this book yesterday and I am here to complain about it, or at least about part of it. Dan Brown is the guy who wrote the Da Vinci Code, which I very much enjoyed in an alternate-universe kind of way. This book has the same hero, a professor at Harvard who is supposed to have written a book called "Christianity and the Sacred Feminine". So you might think this professor character would be familiar with the gospels. 

However. On page 349 of the paperback, an artificial intelligence program declares: "Those who live by the sword will die by the sword." 

And what does this expert on Christianity think to himself? "Langdon did a double take. Did Edmond's computer really just paraphrase Aeschylus?" 

I did an eye roll. Does this author really not know that this commonplace phrase comes from Jesus?

Aeschylus apparently did say something similar, sort of, maybe, depending on how it gets translated. But as quoted, it sounds just like what Jesus said, according to the Gospel of Matthew. And it's the version from Jesus that is a commonplace saying throughout our culture. There is nothing remarkable about someone knowing that phrase! 

This is a mainstream best seller by a popular author who makes a point in his afterword of thanking all his wonderful editors and the helpful historians and religious scholars who went through his text. Has no one in this collection of editors ever read the gospels? 

The editors he hired 

Were less than divinely inspired.