Your friend saw this resource on bethinking.org and thought you should see it:
Epistemology - What is it to Know?
This three part seminar gives an historical overview of the various schools of thought on the subject epistemology - how we can know anything.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/truth/epistemology-what-is-it-to-know
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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.