I am reading Mere Christianity at the moment and was inspired to share this quote from C.S. Lewis on the purpose of the Moral Law in showing sinners their need for forgiveness:
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Christianity tells people to repent and promises them forgiveness. It therefore has nothing (as far as I know) to say to people who do not know they have done anything to repent of and who do not feel that they need any forgiveness. It is after you have realized that there is a Moral Law, and a power behind the law, and that you have broken that law and put yourself wrong with that Power—it is after all this, and not a moment sooner that Christianity begins to talk.
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Atheist Tuesday: Does God Have to Obey the 10 Commandments?
The first thing in answering the objection is to make sure we understand exactly what the commandment says. “Thou shalt not kill” is actually a misquote.
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