How do we know that the law reveals our need for a Savior?

The law serves as a mirror, reflecting our shortcomings and the holiness of God, as described in Romans 3:20, where it states that 'by the law is the knowledge of sin.' When Israel stood at the base of Mount Sinai, they understood their inability to commune directly with God, leading them to plead for a mediator. This recognition that they could not fulfill the law’s demands underscores humanity's essential need for a Savior, who in Christian theology is Jesus Christ. As detailed throughout the New Testament, particularly in Galatians 3:24, the law was intended to lead us to Christ so that we may be justified by faith. Therefore, the purpose of the law is to reveal our need for salvation, which is only fulfilled in Christ's redemptive work.