Why is the doctrine of Christ as a sure cornerstone important for Christians?

The doctrine of Christ as the cornerstone of our faith, likened to a nail in a sure place, underscores His decisive authority and stability. This assurance is vital for Christians because it instills confidence in our salvation and the sustaining grace of God. In Isaiah 22:23, God declares that He will fasten Christ as this nail, meaning all the promises of God culminate in Him. For every believer, knowing that Christ cannot fail and that He securely holds our salvation provides peace and certainty amid life's uncertainties.