How can Christians have assurance in their faith?

Assurance in faith comes from recognizing that salvation is rooted in Christ's completed work and not in personal merit. As articulated in 2 Peter 1:20-21, the Scriptures are the ultimate authority for what believers hold to be true. This means that Christians do not rely on subjective feelings or experiences but on the objective truth of God's word. Moreover, the shared faith that believers possess, as mentioned in 2 Corinthians 4:13, allows them to speak and live out this assurance together. When believers trust solely in Christ's righteousness and His work on the cross, they can have full confidence in their standing before God, knowing that His promises will never fail.