How do we know that we are under grace and not the law?

The distinction between being under grace and under the law is vital for Christians. In Romans 6:14, Paul assures believers that sin shall not reign over them because they are not under the law but under grace. This means that the law, which reveals sin and condemns those who fall short, has no authority over the believer's life. Rather, through grace, believers are empowered to walk in newness of life, as they are united with Christ in His death and resurrection. This understanding helps Christians to reject any temptation to revert to the performance-based mindset of the law.