Testimony is Evidence

[Ravenshire]

Here's another secular case: Do you believe Abraham Lincoln gave a speech in Gettysburg on Nov. 19, 1863? If so, on what evidence do you base your belief?

Sure, there's testimonial evidence of the speech which does a good job supporting this:

Physical evidence of the speech in the form of original drafts, preserved by the Library of Congress.

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People can lie or be deluded and gain nothing for doing so. Or there is the fact that just because you can't think of a motive does not mean there is not one. So this this standard does not work.

Further, they can repeat lies, speculations, assumptions, etc... they've been told that they accepted as true, with or without motive.