The basis is God, not the Mosaic Law. I agree that the Ten Commandments can be used to explain sin and, as Paul said, that the Law magnified sin that it was clearly understood. But it is not biblical to define sin as a violation of the Ten Commandmens and it is not biblical to state that the lost will be judged on the basis of the Ten Commandments.The conscience is also used by the Spirit to convict/reprove of sin.
But there is a basis, an essential that the conscience functions on.
Do unto others...
Whether I hear, know and/or believe the 10 commandments I don't want anyone to break into my house and steal stuff so it is reasonable that I shouldn't steal from another either.
HankD
Comfort takes too many liberties with Scripture for my comfort.