[Prudence]

The majority in this decision was likely trying to make the point, as GD mentioned already, that the difference is bringing in the written word, not just a recitation of previously learned verses. Conversely, the dissent is saying that it's just the written word of what they already believe, so what's the big deal. It's a tough call. I'd probably side with the majority, though, and draw a bright line prohibiting consulting any outside materials.

Note that does not prohibit one from drawing on one's own memory and experiences, including memory of bible verses, church teachings, gossip from last week's coven meeting, etc... But as a culture the written word is still seems more powerful to some, and there's a difference between saying that verse such and such says this and having the actual document on hand.

As my dad would say, subtle but significant.