How do we know Christ's atonement covers our sins?

Christ's atonement covers our sins as affirmed in several passages of Scripture. Colossians 1:21-22 states that we have been reconciled in Christ's body, presenting us as holy and blameless before God. This underscores the profound truth that our justification is not based on our own merits but solely on Christ's sacrificial work. Additionally, Hebrews 10:10 emphasizes that through the offering of the body of Jesus Christ, we are sanctified once for all. The implication here is that our position before God is secure because of what Christ accomplished, assuring us that our sins are put away, not just temporarily, but permanently. This is foundational to understanding our identity in Christ and living in the reality of His grace.