"For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves: Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another;)";
Mankind intuitively knows they are spiritually dead; The law of God is on everyone's heart; We are commanded to obey God's law

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Scripture References:
Rom 2:14-15