How does the cross relate to assurance of salvation?

The work of Christ on the cross is the cornerstone of the believer's assurance of salvation. The doctrine of effectual atonement posits that Christ's sacrifice was sufficient to fully satisfy the demands of God's justice for His people. As articulated in Colossians 2:13-14, our sins are completely forgiven through the cross, which removes the debt that stood against us. This assurance is rooted in Christ's successful work and not in our performance, allowing believers to rest in the certainty of their salvation.