What is the significance of being 'made just' in Christ?

In Reformed theology, to be 'made just' means that upon faith in Christ, believers are declared righteous before God. This doesn't stem from any works or merits of their own, but rather through the imputation of Christ's righteousness. 2 Corinthians 5:21 tells us that God made Him who had no sin to be sin for us, so that in Him we might become the righteousness of God. This great exchange is pivotal to our faith as it assures us of our standing before God, freeing us from the anxiety of performance-based acceptance and allowing us to live joyfully in relationship with Him.