What makes a book “clean”?

So I think that the idea of “clean” content can align with Christian beliefs, (since the Bible is clear that sex is supposed to happen exclusively in the context of marriage) but we encounter an issue when clean books are promoting a secular, idolatrous worldview.

Provenance (Book Review)

Thematically, I liked the discussion of spiritual adoption, paired with earthly adoption. For me, this provided fresh insight into the Scripture on adoption. Plus, the commentary on forgiveness is spot on. Recommendation: Reader’s Discretion