You could tell them that a definition of "right" and "wrong" is a definition established not only by time, but also by simple geography. You could allow them to notice that some activities on your planet {prostitution, for instance} are illegal in one place, and, just a few miles down the road, legal in another. And so, whether a person is judged as having done something "wrong" is not a matter of what that person has actually done, but of where he has done it.
( Neale Donald Walsch )
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