One of the main tropes of the Bible is that of light and dark. Light represents the holiness of God and dark represents his love/grace. Throughout the law are prohibitions against mixing. These prohibitions are against mixing law and grace. When men mix then they become confused. If a judge sets a criminal free, men do not marvel at the wonderful grace... they complain that there is no justice. But if they are the criminal and not set free, they do not praise the wonderful justice, but complain that there is no mercy. :<ref>[[Ge 1:3]] ¶ And God said, Let there be light: and there was light.:[[Ge 1:4]] And God saw the light, that [it was] good: and God divided the light from the darkness.:[[Ge 1:5]] And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.</ref>