Why is the concept of Christ as all important for Christians?

The concept that Christ is all is vital for Christians as it underscores His comprehensive role in every aspect of our faith and existence. From being the author and finisher of our faith (Hebrews 12:2) to the very life we have (Colossians 3:4), nothing in salvation or sanctification operates outside of Christ. This truth emphasizes our dependence on Him for righteousness, hope, and eternal security. Without Christ being all, we risk the misconception of attributing any part of our salvation to ourselves, thus undermining the grace of God that is entirely rooted in Him.