How do we know that the law is still important for Christians?

The importance of the law for Christians is underscored in the Sermon on the Mount, where Jesus states that those who break even the least of the commandments and teach others to do the same will be called the least in the kingdom of heaven. This implies that all commandments hold weight in God's expectations for His followers. Moreover, Romans 3:31 reinforces this idea, stating that faith does not nullify the law but establishes it. Therefore, the moral law remains a guide for Christian living, shaping our understanding of righteousness and our relationship with God.