Your friend saw this resource on bethinking.org and thought you should see it:
"Is Seeing Believing?"
Is our own experience the final and only arbiter for what we can accept as true?
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/can-we-know-anything/is-seeing-believing
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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.