[Mrs. Don-o]

Good. That's the outlines of a Natural Law argument which prescinds from supernatural (revealed) law as a method of argument, but reaches the same conclusions.

That is perfectly legitimate, since the same Divine Author is the source of both the Book of Nature and the Book of Scripture.

That's exactly what I was talking about.

[MrB]

Simply put, without THE Basis of epistemology, there is NO basis for knowing anything, especially in the realm of right and wrong, good and evil.

Without a completely objective source to measure against,
right and wrong are just an opinion,
and those who state that Scripture is not the reference point simply don’t live that way.

Without this basis, they have no justification to call anything “wrong”.