Law in Our Hearts-Not in the Unbeliever's: Do unbelievers have a conscience, but not the law, in their hearts? [Romans 2:14, Romans 2:26, Romans 8:4, Ecclesiastes 3:11, Jeremiah 31:33, Isaiah 7:16]. Law or Laws on Heart: Is the law (singular) or laws (plural) on our hearts, the Old Testament commands, or the Love of Christ? [Jeremiah 31:31].