" We can distinguish the good from evil because we have a moral sense bred into us. This is what Paul meant when he said humans both obey God's law and know themselves in violation of it by virtue of the law “written on their hearts” (Romans 2:15). Remember, we accept that the conscience is written on the heart not because the Bible makes it so by saying it, but because the Bible reports that God made humans this way. Human experience teaches that there has been from the beginning of time a moral law that all people and all cultures can know. For "

― Charles W. Colson , The Faith: What Christians Believe, Why They Believe It, and Why It Matters