Why is understanding Christ's impeccability important for Christians?

The impeccability of Christ is essential for Christians as it assures us of the reliability of our salvation. If Christ had sinned, He would have been unable to atone for our sins and be a perfect substitute. This is crucial because it speaks to the nature of God's justice and mercy; God cannot overlook sin without satisfying His justice. In Romans 8:31-32, we see that if God did not spare His own Son, but delivered Him up for us all, how will He not also graciously give us all things? Christ's perfection ensures that our faith is well-placed in Him as our Redeemer, who cannot fail us.