How is Christ the cornerstone of the church?

In Ephesians 2:20, Paul describes Christ as the chief cornerstone of the church, symbolizing His foundational role in the faith community. The cornerstone is crucial, as it determines the alignment and stability of the entire structure. Believers are built upon this cornerstone, meaning that their faith, unity, and spiritual growth are entirely dependent on Christ's work. This analogy highlights the transformative power of Christ in the lives of believers and signifies that the church, despite its imperfections, is perfect in Christ, as He upholds and sustains His body, ensuring that it continues to grow into a holy temple.