UK I think it has something to do with choice. If God made everything permisable to us, then how would we practise our faith? Choosing between what is deemed as right or wrong is something to classify a follower of the faith. If nothing God put on this earth was not permissable than everyone would be doing the same thing.

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"Diplomacy is the art of saying 'Nice doggie' until you can find a rock - Will Rogers"