We know we need a Savior because the law exposes our inability to achieve righteousness and confirms that all have sinned.
The law of God serves to reveal our sinful nature and our failure to uphold His commandments, thereby indicating our desperate need for a Savior. As Romans 7 reveals, the law is spiritual and holy, yet it magnifies our shortcomings as we recognize that we cannot fulfill its demands. The indictment of sin leads us to grasp that we are guilty before a holy God, and as stated in Isaiah 48:9-11, God desires to maintain His justice and glory. Without a Savior, we stand condemned, for the soul that sins must die. Hence, the necessity for a Redeemer becomes evident, who can step in to bear the penalty of our sin and provide us with righteousness through faith in Him.
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