Your friend saw this resource on bethinking.org and thought you should see it:
Searching for certainty in an uncertain world
This short book explores whether we can be confident in the truth in our post-truth age.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/can-we-know-anything/more-truth-review
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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.