They may not have meant this, but I took it to mean "overlooked by some groups". Especially nonreligious types, I feel, could learn from a lot of the secular wisdom in the Bible (and I say this as an agnostic). And I know there are many contradictory, sexist, barbaric, and other awful things in there, and I'm not trying to apologize for those bits. Just that there's more good things in there than many nonreligious types often know.

As an example, my agnostic, very nerdy brother read the whole thing and said he learned a lot from it. I figure there's a lot of potential people out there just like him.