Why is preaching Christ alone essential for a church?

According to the sermon, the message of the gospel must center on Christ and Him crucified, as this is the only basis for true salvation. In Hebrews 13:10, the author notes that we have an altar—that is, Christ Himself—who is the sole source of spiritual sustenance. Preaching anything else, such as works or law, shifts the focus away from the grace of God and toward human effort, which leads to spiritual instability. A church that proclaims Christ alone not only honors the sufficiency of His sacrifice but also nurtures a heart of genuine worship and praise among its members.