Simon Greenleaf (1783-1853) had a distinguished career in American law. He was reporter to the Supreme Court of Maine for twelve years and professor of law at Harvard from 1846. His "Treatise on the Law of Evidence" was a standard textbook during the second half of the nineteenth century. He was therefore well-qualified to write this essay which applies to the Gospels the principles used in relation to witness evidence in American law courts.
Among these principles are:
`Every document, apparently ancient, coming from the proper repository or custody, and bearing on its face no evident marks of forgery, the law presumes to be genuine, and devolves on the opposing party the burden of proving it to be otherwise.'
`...if it is a question of fact in human affairs, nothing more than moral evidence can be required, for this is the best evidence which, from the nature of the case, is attainable.'
`...every witness is to be presumed credible, until the contrary is shown; the burden of impeaching his credibility lying on the objector.'
Using these principles, Greenleaf concludes that the Gospel writers should be considered credible witnesses to the events they describe. He points out that, `The character of their narratives is like that of all other true witnesses, containing ... substantial truth, under circumstantial variety.' And, `If these different accounts of the same transactions were in strict verbal conformity with each other, the argument against their credibility would be much stronger.'
In other words, the Gospels agree on the main incidents of Jesus' life but do not always agree on the details. They did not collaborate to make their accounts agree word-for-word and this indicates that they are independent witnesses.
Of course, the authors of the Gospels are not available for cross-examination and historians have additional methods to bring to bear on the manuscripts but, within these limits, Greenleaf makes a sound case.
I disagree substantially with the review by `A Customer'. The names of the four gospel authors are the only ones recorded; the names were assigned on the basis of available evidence, not `merely' assigned. There is a strong historical possibility that Mark wrote Mark, that Matthew wrote the teaching material contained in Matthew, that Luke wrote Luke/Acts and that John wrote the narrative sections of John. Scholars have so many manuscripts of the gospels that they can be confident that we have their texts substantially as the authors wrote them.
Greenleaf states the principles that are used in a court of law. If he says that `every witness is presumed to be credible, until the contrary is shown,' he is not being `very naïve', he is simply stating common legal practice. When Greenleaf says that witnesses agree in substance but disagree in detail, he is simply stating the truth about eyewitness statements.
A Customer's choice of `modern bible researchers' is biased. He does not mention FF Bruce, CL Blomberg, NT Wright, or even EP Sanders.